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Monitors Electric Use - American Radio History

1. EE Designer III from Visionics Corp EE Designer III is the costliest soft ware package among our reviews and also the most difficult to learn But for your 995 you also get PCB soft ware for converting schematic cap ture files into functional printed cir cuit boards plus analog and digital logic circuit simulators that catch de sign errors before they become hard ware problems To use the advanced features EE Designer offers you have to add 1 5MB of LIM compatible RAM to your PC not a cheap trick Without the extra memory you can run the Hi WIRE Plus ProCAD Xtra program in only the demo mode which doesn t support PCB layout or circuit simulation The program re quires use of a provided copy protec tion hardware connector in order for it to operate Using EE Designer can be tedious First you haveto memorize dozens of commands then navigate a labyrinth of menus to find them Fortunately each command has a related key board key that reduces the number of times you have to drag and click on the mouse making the program easi er and faster to use once you have 40 MODERN ELECTRONICS January 1991 mastered the technique The component library consists of about 1 250 devices stored in a single library module that consumes almost 4MB of hard disk space This is a fair though not rich number of de vices for a program of this caliber Howev
2. Cleveland Institute of Electronics Inc 1776 East 17th St Cleveland Ohio 44114 C YES Please send me your independent study catalog For your convenience i CIE will have a representative contact you there is no obligation e JA Print Name Va Address Apt A 5 P aity State Zip TT k2 ge Area Code Phone No 2 heck box for G I Bill bulletin on educational benefits O Veteran Active Duty Mail This Coupon Today oo i g rl 5 i prts VOICE TIMER y a j SELECTIVE Y f SOLON NOTCH k b TET A s J e mama FC r m ye Lm COMMUNICATIONS RECEIVER o r KENWOOD Cum MODE KEY r BESETA NB O IF SHIFT AF RF CLOCK1 OFF CLOCK2 p p 0 Sl e ee HOUR MINUTE US8 w VAM Lu 4 ON FF TME CIE 7 m N i TRE Time SET F 7 k rz PF 1 P am 4 ANTI ANT2 For STEP A 8 0 AGC RF ATT FUA N N H p Mo T T 7 adds SAC FES puer o J DOWN BE gu V 20 dic 30 ous EKT lt ENW E fF L eT Qf Or 2h Sto A a 4 Scan the NC n wit Kenwood s R 5000 R 2000 and RZ 1 Listen in on foreign music news and commentary Monitor local police fire and other public safety services as well as the Marine channels and the many other services he VHF ana R 2000 nverter options must be used in the R 5000 The R 5000 is a high performance top of the line receiver with 1
3. r M sm P P n H U c ms a aM E m IR tionally available interfaces for DXF files AutoCAD and PDF files P CAD Although only one component li brary is active at a time it s a snap to select a component from another li brary or create a new symbol without ever leaving the editor to make it the active one Operations mostly witha mouse are easy being only a few mouse clicks away for nested com mands Pop up menus for making choices among many selections avail able further simplify matters For ex ample calling up a library produces a pop up menu with all the devices in it for you to click on for a selection You can type in a device name at the command line too if you wish An extensive Help menu is a good assist too with a listing by name and syntax coming up in a window Typ ing the name you want for more in formation when this is done displays an explanation of the word Help menus can be defined by the user too There are also 40 function key control set ups They too can be user defined Macros and toggle menus also add to the program s productivity ProCAD isn t among the easiest schematic capture programs reviewed Owing to its great power which also means many choices that can be made Therefore the foregoing as sists are most welcome Nevertheless when one becomes very familiar with all its workings through heavy pro duct
4. ADORESS LINES D DUE the cs FX signal If the CPU is read ing the data RAM addresses are in dexed or generated by the falling edge of the CS FX signal However if addresses are generated to be used as addresses while writing data to the data RAM inputs to the counter are generated by the falling edge of the AD CLOCK signal The CPU issues a high to the DISP RAM WR line to open the channel of AD CLOCK pulses to the counter if the proper trigger has been set Note that the U33 flip flop is reset at the same time as the counter is set to zero Once the trigger has been satisfied by either a normal or auto trigger signal the gates are opened This action al lows the AD CLOCK signal to index and generate addresses 1f the CPU is reading the data RAM it generates a high at DISP RAM RD This allows the CS FX signal to index the counter thus producing the addresses for the data RAM read cycles DATA RAM WRITES Rmpuwz m n M ss sr s d d P Isa Power Supply The power supply shown schemati cally in Fig 5 is plain vanilla in design You must supply a regulated 5 volts at 350 mA and 12 volts at 100 mA Note that a separate 5 volt supplies reference voltages to the A D converter and trigger compara tor This decouples the digital and analog supplies to reduce coupling of digital pulses
5. Compact Disc Troubleshooting amp Repair Neil telle Thomas ortt 8 Ei EDITORIAL iii Author s Guide There are a lot of directories for writers that list a publica tion s article needs and requirements I just finished filling out some forms for one of them in fact Such question naires typically ask about the type of article purchased from free lance not salaried staff writers policy on mak ing assignments or working on speculation the best way to break into your publication and so on Over the years however I ve never come across a ques uon relating to anything personal such as religious beliefs politizal leanings etc though one can use write in space provided on forms to indicate such policies Doubtlessly there are some publications that do have such restrictions and there may be perfectly ethical reasons for this when an editorial focus is especially narrow and requires a definite slant Electronics and computers do not fall within this spectrum of course That s why I was taken aback recently when one of our favorite admired writers Forrest Mims who writes Mod ern E ectronics s Electronics Notebook every month told me that Scientific American magazine refused to ac cept any more of his work as the writer of its Amateur Sci entist column when it learned that he believes in the bibli cal concept of creation rather than Darwin s theory of ev olution Forrest s work
6. Easy Results comparable to 2 500 pro ectors PLANS AND 8 LENS 27 95 Professional Sys tems available Illustrated Catalog FREE MACROCOMA 15ME Main Street Washington Crossing Pennsylvania 18977 Creditcard Orders 24 HRS 215 736 3979 ELECTRONICS KINETIKITS from KINETICO electronic kits outputting light or scund Free catalog KINETICO P O Box 1634 NY NY 10114 0508 MINIATURE FM TRANSMITTERS Track ing Transmitters Voice L isguisers Bug De tectors Phone Devices More Available in kits or assembled and tested Catalog 2 00 XANDI ELECTRONICS Box 25647 B7 Tempe AZ 85285 5647 SURVEILLANCE COUNTERSURVEIL LANCE devices catalog Cameras bug detec tors video camera detectors transmitters communications and much more Catalog 3 00 DSP P O Box 1275 ME Redondo Beach CA 90278 LASERS Imw to 2kw worlds largest selec tion of new and used surplus FREE CATA LOG MWK Industries 1269 Pomona Rd Corona CA 714 278 0563 SURVEILLANCE COUNTERSURVEIL LANCE Guaranteed lowest prices Unbeliev able Detectors Jammers Transmitters Phone Security Cameras Personal Protec tion Books More Huge catalog 5 00 Re fundable PROTECTOR F O Box 520294 B Salt Lake City UT 84152 50W SUBWOOFER Add awesome bass to your home stereo system This is an excellent performing component not cheap junk Complete plans 18 00 C Rotthoff Box 70 Atlanta GA 3027
7. 9 9j 3 TIO i did AS H29 129 Qui O 3 6r2HvZ 6 2Hb4 aerial ESSI 950 T v02H 4 NO1U013I2SO ZHM OZ Q 1H n 1 25 Fig 7 Schematic details for timebase circuit January 1991 MODERN ELECTRONICS 21 Say You Saw It In Modern Electronics source The trigger circuit can be set to one of four different modes In AUTO mode the trigger is gener ated by the timebase generator signal divided by 40 CLK 40 LEVEL SLOPE and GAIN controls have no ef fect This mode is not used frequent ly and is generally employed to make the signal display on the screen The most common mode is NORMAL de scribed above Just set trigger con trols for the desired display Note that the display blinks slightly every 0 3 second This blink occurs when the program is reading the data RAM and moving data collected to the dis play area in system RAM Once you have the display you wish to study press ARM FREEZE switch S5 to freeze the display SINGLE STEP mode is used if only one pass of the signal is desired To use this mode set TRIGGER MODE switch S2 to SINGLE STEP then when you are ready to wait for the trigger press S5 The trigger circuit will then wait for a trig ger signal After this signal is re ceived data is stored and displayed To repeat single step action press S5 again The last selection in S2 selects if the trigger signal used is ac or dc coupled Note that EXT TRIG input J8 is ac coupled only Logi
8. A Guide to High Perfor mance DMMs begins with a definition of the high performance DMM It also includes sections on Extended Measure ment Capabilities Recording Modes Special Features and Accessories A chapter on Selecting True rms and Aver aging meters offers information on matching the technician and application to the right meter CIRCLE NO 58 ON FREE INFORMATION CARD Electronics Catalog The 1 280 page electronics Catalog 111 from Newark Electronics Chicago IL contains com plete technical information and dimen sions for more than 100 000 electrical and electronics products from 250 leading manufacturers Twenty new manufac turers and more than 15 000 products have been added to this latest catalog Other additions include a 16 page four color product section an easy to follow How To section for using the Catalog an expanded Surface Mount Devices sec tion and a new indexed Premises Wiring Products section CIRCLE NO 59 ON FREE INFORMATION CARD E 82 MODERN ELECTRONICS January 1991 ADVERTISERS INDEX AMC Sales Ace Communications Cable Plus Cleveland Inst of Elec Command Productions Consolidated Electronics Cook s Institute Deco Industries Electrim Corporation Electronics Book Club Global Cable Network Global Specialists Grantham Information Unlimited Kelvin Electronics Kenwood Listen Electronics MCM Electronics M K Electronics Mental Autom
9. ICD 08559 fM JANUARY 1991 2 95 CANADA 3 95 dii I E A Digital Storage Scope For Just 200 E Watt Watcher Monitors Electric Use Modern Electronics Computer Experimenter Lak p 12 Schematics From Your PC p 35 Guarch Plus Build a Code Practice Oscillator Compact Disc Technology and Computers e Melody Circuits and Other Interesting New ICs Latest Technical Books amp Literature more Cover ru moor ft pi Ft Li L LI VER 1C R7OOD ot S6AN START STOP ls 5 Es MEMORY 2 Alin ICOMs IC R71A and IC R7000 are the professional s choice for receiving inter national broadcasts aircraft marine business emergency services television and government bands These people demand the finest in communications and so do vou ICOM puts the world at vour fingertips with the IC R7000 25 2000MHz and IC R71A 0 1 30MHz commercial quality scanning receivers Incomparable Frequency Control Both the IC R71A and IC R7000 feature direct frequency access via their front keypad main tuning dial optional infrared remote control and or computer interface adapter Incredible Flexibility Full Coverage Maximum Performance The superb IC R71A is your key to world wide SSB CW RT TY AM and FM optional communications plus foreign broadcasts in the 100kHz to 30M Hz range It features IF Notch low noise mixer circuits and a 100d
10. In this month s column we examine a number of interesting chips and circuits and give details on obtaining a free data base of Motorola devices Two Pin Serial Number Chip Dallas Semiconductor 4350 Beltwood Pkwy S Dallas TX 75244 has an nounced a 64 bit chip that holds a unique serial number that can identify printed circuit board PCB assemblies or pro vide a network address or an access code In the case of a subassembly the DS2400 Silicon Serial Number chip can act as a license plate that uniquely identi fies each one As the subassembly goes from one test station to the next it can be logged in at each station to facilitate tracking increasing the efficiency of the manufacturing process Unlike bar codes this tag can be read without sup plemental optical equipment After the subassembly is shipped as part of the equipment the DS2400 also has advantages for end users First they need not tear apart the equipment to find the buried serial number Because the number is electronic a few keystrokes will display it on any screen If a subas sembly is faulty it can be referenced through this number Secondly the chip facilitates asset management end users can monitor highly mobile computers and components The DS2400 Silicon Serial Number chip has only two pins data and ground With a multiplexing scheme the chip re duces data control and power to just one pin This is made possible by an intern
11. hookup wire solder etc Say You Saw It In Modern Electronics Cut away center and discard 17 8 Fig 2 Inductive pickups are built around laminations salvaged from a small 15 laminatiors y Corrugated zardboard a d I ed P 350 turns No 26 wire gat She power transformer through one of the three resistors via switch S to meter M1 Resistors R1 R2 and R3 are in the circuit to provide calibration for the meter to register accurate readings The values of these resistors are de termined during calibration of the project Switch S provides range selection capability Construction Begin construction by fabricating the two inductive pickup assemblies For these you need laminations salvaged from a small power transformer A defunct small home stereo unit or other light duty electronic device may have just what you need Other wise purchase a new power trans former and use it The laminated core of the trans former you use must have E and I shaped laminations as illus Say You Saw It In Modern Electronics trated in Fig 2 The transfcrmer used for the prototype had laminations that measured approximately 2 inches square and contained 30 each E and I laminations half of which were used for each pickup assembly As shown in Fig 2 you must re move the center bar of each E lamination with sheetmetal shears or a hacksaw If y
12. ou PQ COMPLETE PACKAGE x Easy to use schematic entry program for circuit diagrams x Visable on screen and pull down menus x Supports popular graphic standards mice and printers x Powerlul editing and drawing commands Extensive digital analog and discrete part libraries x In depth readable instruction manual x Over 120 screens of on line help information x Softwa e includes part building and netlisting Add P C board layout software and routing software for only 99 each W ite or call for FREE demo disk N J ORDERS INFORMATION Send check or money orders to Mental Automation Inc 5415 136th Place S E Bellevue WA 98006 N x A Visa amp MasterCard orders accepted CIRCLE NO 45 ON FREE INFORMATION CARD January 1991 MODERN ELECTRONICS 35 Schematics From Your PC Part 2 A close look at popular schematic capture programs um Ame W M M of wx V MS d d dw wmm s Mig m By TJ Byers T he fundamentals of PC soft ware programs that let you draw electronic schematics were discussed last month As cited such programs can substantially re duce the time it takes to produce pro fessional quality schematics com pared to doing it manually A key to their productivity is of course their capacity to make drawing revisions on screen rather than on drafting paper Moreover you don t need any drafting skills The better programs called
13. ve spent more hours than I want to admit to over the years lost between its covers If you wanted to know where to go to for in formation on windmills or to find out where plans for your own hydroelectric dam were available it was in The Whole Earth Catalog as were sources on self health materials and a host of other cur rent and arcane categories Lest you think that the Catalog was just for those of the counter culture ready to give up the comforts of modern living The Whole Earth Catalog was quick to embrace the newly emerging technology of microcomputers The ra IET M 2 J M P ea 68 MODERN ELECTRONICS January 1991 Say You Saw It In Modern Electronics Office Resources Microsoft QuickB ASIC is a powerful easy to learn easy to use structured BASIC for beginning or expert programmers The QuickBASIC Interpreter is the simplest quickest way to unleash the power of your Macintosh The Microsoft QuickBASIC Interpreter includes the interpreter portion of Microsoft QuickBASIC Three semple QuickBASIC progrems ere also included with source code and the compiled applications Microsoft Works is uu on DN software package containing the five most commonly used software wols word processor with spell checking end meil merge spreadsheet with charting database with reports Communications and
14. FAX 407 264 0473 Offices 76 North Broadway Hicksville NY 11801 Tele phone 516 681 2922 FAX 516 681 2926 Modern Electronics ISSN 0748 9889 is published monthly by CQ Communications Inc Subscription prices payable in US Dollars only Domestic one year 18 97 two years 36 00 three years 53 00 Canada Mexico one year 21 00 two years 40 00 three years 59 00 For eign one year 23 00 two years 44 00 three years 65 00 Foreign Air Mail one year 76 00 two years 150 00 three years 224 00 U S Government Agencies Subscriptions to Modern Electronics are available to agencies of the United States government including military services only on a cash with order basis Requests for quotations bids con tracts etc will be refused and will not be returned or processed Entire contents copyright 1991 by CQ Communications Inc Modern Electronics or CQ Communications Inc as sumes no responsibility for unsolicited manuscripts Al low six weeks for delivery of first issue and for change of address Printed in the United States of America Postmaster Please send change of address notice to Modern Electronics 76 North Broadway Hicksville NY 11801 CQ Communications Inc is publisher of CQ The Radio Amateurs Journal Popular Communications Modern Electronics CQ Radio Amateur Spanish CQ and the CQ Amateur Radio Buyer s Guides Say You Saw It In Modern Electronics Years THE MAGAZINE FOR
15. If you cross wires a warning beep is sounded and a visual X mark is dis played at the short location to alert you to a possible short circuit For a schematic this is not a short but you have the option of continu ing along or placing a dot on the crossover in the event you want a connection Particularly noteworthy is Pro CAD s signal and node display func tions For example a few mouse clicks on a command subcommand and wire line will highlight all wires that are logically connected together Or you could type say GND on the command line and all wires leading to ground will be highlighted An other refinement is the wide choice of grid units in which you can work in cluding inches millimeters centime ters and microns You can also choose a line grid or a dot grid or make them invisible There s also a ghost grid to ensure finer movements Mouse click steps are reduced by some operating efficiencies For ex ample you can repeat a command and subcommand you just com pleted working with by simply click ing the left button or pressing ENTER In other instances the program auto matically switches the highlight bar to the proper subcommand when the next action is obvious Among many other features is a LOG function that records everything you do sothat you can backtrack in the event you want to search out an error you made De letions are saved too which can be recalled at any depth if required
16. One program ProCAD is copy protected allowing a copy to be loaded onto only one hard disk at any one time Hard copy printout ability varies considerably among the programs A few let you fit the drawing to the page size and all but one support a plotter directly The amount of printer or plotter control you have from the software also varies greatly ranging from no control to full control Many of the programs provide support for working with other allied programs This might include con versions for use with much costlier professional CAD programs such as AutoCad and P ersonal CAD and circuit simulation packages such as PSpice Simulog and others You should make a buying choice based on your near future or even more distant needs as well as budge tary considerations It s certainly de sirable to get a demonstration disk from the software company which most offer for free or for a modest charge usually 10 It is typically de ducted from the program s price if you buy it The demos will give you a feel for what the product can do or cannot do Interactive CAD Sys tems alone among the companies offers its complete ProCAD pro gram on a demonstration basis It has a built in software counter that locks you out after 50 uses Individually here s how the pro grams stack up January 1991 MODERN ELECTRONICS 39 EE Designer III OrCAD STD III A i ih Iz
17. a P all x34 etas Jj tF pag LN r I m un iima Ground wire to grounding rod Fig 4 Pickups must be positioned on insulated wires coming from utili ty company kilowatt hour meter before fuse panel 34 MODERN ELECTRONICS January 1991 Say You Saw It In Modern Electronics Fig 5 Secure pickup assemblies to ac line conductors with cable ties Use pieces of foam rubber to assurea friction fit or an appliance that has a panel on it with the power consumption listed to calibrate the meter For the 0 5 KW range a few table lamps or overhead 250 watt load for a center of scale reading on the meter With the loads turned on adjust the resistance substitution box or po tentiometer for a reading equal to the GIANTS meo Eee SSeS rr ad aa aT XY t i M JU H g load Note on a piece of paper the value of resistance needed for R to obtain this meter deflection Similarly establish loads for 2 5 and 25 kilowatts you probably will not need the latter unless you have really heavy duty appliances to ob tain the resistance values needed for R2 and R3 respectively If you use a potentiometer instead of a resistance box for these two ranges make it a megohm unit Once you know the values of resistance needed in all three cases you can install the near est 1 or 5 percent tolerance standard
18. inside your Packard Bell computer system with exclusive NRI Training Kit Manuals plus technical specs direct from the manufacturer v MONITOR High resolution nonglare 12 TTL monochrome monitor with tilt and swivel hase DISCOVERY LAB Complete breadboarding system to let you design and modify repair faults x DIGITAL LOGIC PROBE Gives you first hand experience analyzing digital circuit operation Using your D A converter along with the exclusive rext to speech software also included you explore the fascir ating technology behind both digitized and synthesized L computer speech You discover how you can use your computer to access and play back 3 variety of prerecorded sounds you see how to add speech and sound effects to programs written in BASIC C Pascal and others you even learn how to produce high quality speech directly from your own original printed text NRI s exclusive new hands on training in voice synthesis is just circuits diagnose and City State Zip One more way NRI gives you the confidence building experience you need to feel at home with the latest advances in computer technology No experience needed NRI builds it in You need no previous experience in Computers or electrcnics to succeed with NRI You start with the basics following easy to read instructions and diagrams moving step by step from the fundamertals of elec tronics to sophist
19. one form or another naturally We chose an approximate 100 price mark for schematic capture pro grams as our bottom cutoff point for reviews since cheaper ones display too many severe limitations for any really serious work The top price ones usually integrated schematic capture and PCB layout packages were limited to those under 1 000 Only their schematic capture attri butes are examined here Their PCB design capabilities will be looked at some other time The number of parts contained in the component library is a very im Say You Saw It In Modern Electronics portant element of a schematic cap ture program Libraries range from 350 to 11 000 devices for the pack ages we examined Bear in mind though that the number of devices listed in a library can be deceiving For instance a gate with an ANSI symbol and an alternate DeMorgan symbol would be counted as two components Also a device might count as four or more components if a single device symbol cannot be manipulated for rotation purposes by a program editor That is you would have to choose the symbol at a particular angle from those in the component library Then again there might be a sin gle component body that s listed ina library with different names to ac count for suffix changes that signify minor differences plastic body or what have you Taking all this into account the 11 000 count noted above for example breaks down to at best 3 500
20. tech equipment including Temperatur Adjustment Complete for IBM compatibles ONLY 9995 l poc For Macintosh with high resolution enhanced graphics 512995 Global Specialties 70 Fulton Terrace New Favn CT 06512 1 800 572 1028 SPECIALTIES 7 5555 aa A products made m USA Parallel Resonance LC Tank Circuit using sweep generator to vary voltage across tank monitoring circuit response Voltmeter Ammeter Frequency Generator Ohmmeter Wattmeter i Oscilloscope includes lab experiment book and exclusive PROTOWARE Interplex Electronics 1990 an E company A021 CIRCLE NO 34 ON FREE INFORMATICN CARD UU LUUD a mur San m csr HiWire Plus is an 895 schematic capture program that also includes PCB layout software for converting schematic capture files into circuit boards The program is easy to learn moderately difficult to use and short on features A hardware copy protec tion device that accompanies the package must be used for it to work The component library comes with 850 devices distributed among seven library modules Most of the part names are generic like pnp or op amp except for the TTL chips which have a 74xxx designation Unfortu nately only one library can be active at a time You have to delete the cur rent library and load a new library when changing device types Components are called up from t
21. velop skills and expertise for all play er levels Coaching can give hints suggest which card to play and allow take back of a bid or card It also per mits players to review a game with all the computer off 8 hours with the computer on An 8 ounce ac adapt er charger is supplied The 84 key Tandy Key Switch keyboard al lows you to interchange the CTRL and CAPS LOCK key caps and functions to provide astandard typewriter layout Included with the full size keyboard are 12 function keys and an embed ded numeric keypad to provide 101 hands on view to see how they inter act as the game progresses Laptop design makes it easy to use Pro Bridge 500 at home and while traveling When opened for play the top displays four screens one 16 character LCD screen with menu options and two player positions two more screens for player positions and to keep score in a layout that makes it easy to follow the game The top panel folds flat and snaps shut when the game is over Pro Bridge 500 measures 9 inches square by 17 inches deep 399 CIRCLE NO 2 ON FREE INFORMATION CARD Triple Power Supply Global Specialties Model 1310 dc bench top power supply has three in dependent outputs 5 volts at 1 am key emulation Other features include an internal modem a 25 pin parallel port con nector and a 9 pin DB 9 RS 232C se rial port connector Options include a IMB user installable memory up grade 400 2 400
22. when you can view the bus and con trol signals at the same time Learning how to design and apply digital or computer circuits is not as difficult as many people imagine The following is a breakdown of some of the steps in the learning process 1 Study how to use binary numbers 2 Learn how basic logic components work Gates and Buffers Latches and Flip Flops Counters and Registers Multiplexers and Decoders 3 Learn how a microprocessor works CPU and Support Chips I O and Timer Ports Communication Chips Various RAM and ROM Chips Simple Assembly Language Programming Understanding these principles by physically making them happen will be enjoyable and can be profitable A scope logic analyzer and analog digital signal generators are particu Say You Saw It In Modern Electronics January 1991 MODERN ELECTRONICS 13 SSRs SS m P UEI a caer c ECC Ee Se PARTS LIST Semiconductors CR1 20 MHz crystal oscillator DI thru D7 1N4002 diode U1 U19 U21 74HC373 U2 74HC 165 U3 74HC138 L 4 74HC139 L5 T4HC04 Li6 U22 U31 74HC00 U7 80C85A U8 6264 U9 81C55 5 UI0 27C64 or 270256 U11 thru U14 74HC390 U15 thru U18 U29 74HC393 U20 LM7805 U23 U24 AD843 U25 HA19216 U26 AD790 U27 74HC32 U28 5863 U30 74HC08 U32 74HC21 U33 74HC74 Capacitors C1 C24 C25 C27 C29 2 2 nF 25 volt radial lead electrolytic C2 thru C23 C30 thru C33 C35 thru C38 90 1 u4F monolithic
23. 6 CRT mV Sensaivity a GAY Acceleration Vonage 10ns Arse Time K Operation Z Aus Delayed Tnogenng Sweep Includes 2 P 1 Probes Good to 50MHz All scopes include probas schematics operators manual and 3 year 2 yrs 1or Elenco scopes world wide warranty on parts amp labor Many accessones available for all Hitachi scopes Cati or write tor complete specifications on these and many other fine oscilloscopes WE NOW True RM5 4 1 2 CARRY ae Dig Multimeter Muttimeter COMPLETE LINE M 7000 f CM 365 OF 135 2 ji 65 FLUKE 05 OC Accuracy i AC OC voltage amp Amos MULTIMETERS 1 Resrstance Resistance 10 200041 ded with Freg Counter Diode Logic amp Trans iesi and delure case Capacitance to 200uF Function Generator Triple Power Supply XP 620 87 Biox Assembled 65 89600 Kit 45 2 10 15V af 1 28 95 ba s to 15V at 1A More ot 4 to 30v al 1A CALL FOR Provides sme inangie square and 5V af VA wave trom Hz to MHz Contains all the desired leatures lor doing 1penimentt AM ot FM capability Features shori circuit protection all supplies SPECIAL PRICING Soldering Station 10MHz Oscilloscope Temperature Controlled 3000 a sg ES 275 DC or AC ed Vert amp Hor Reads Vols 5 Freq Color Convergence Generator Quad Power Supply XP 580 59 95 2 20V a 2 12V at 1A Sv at 2A A SVa SA Fully regviated and short iram protected XP 575 without meters 39 05 GF
24. Actually this reduced amount is a powerful number of de vices All the programs allow the user to create his own device too All but one component library EE Designer are made up of several li brary modules allowing you to de lete unused libraries from vour hard disk in the event you have a space shortage One program Schema has a data compression feature for li braries to minimize data space used Library modules are typically di vided according to either generic types such as TTL CMOS PAL etc or by manufacturer Intel Mo torola etc In normal schematic drawing work the screen can show only part of the sheet so you generally have to move it to get to a different section Five of the programs have autopan which automatically scrolls the worksheet when the cursor touches the edge of the screen enhancing ef ficiency All the programs have a zoom function to magnify an area Some provide minimal zoom effect while others Protel and ProCAD exhibit unlimited power One program HiWIRE won t let you disable the ortho drawing mode making it impossible to draw diagon al lines or wires Six programs have on line help All support both flat and hierarchical drawings Two programs have a hardware se curity device called a dongle that must be plugged into the parallel printer port before the program will load The printer then plugs into the dongle and operates as though the dongle wasn t there
25. C26 C28 22 pF 16 volt disc C34 1 000 pF disc C39 C40 10 pF disc C41 47 pF C42 C44 3 to 10 pF pc mount trimmer C43 10 to 70 pF pc mount trimmer Resistors watt 5 tolerance R1 10 000 ohms R2 470 ohms R3 R27 R28 4 700 ohms larly helpful in learning because you see the signals generated as well as the results A signal generator is used to produce signals necessary to stimu late the inputs of various logic com ponents while the scope verifies results In the logic analyzer mode up to eight different signals can be moni tored simultaneously The programs needed to generate signals for each R4 R25 R26 10 000 ohm potentio meter R7 R9 1 000 ohms R8 2 000 ohms R10 R11 1 megohm R12 R13 R14 220 ohms R15 50 000 ohms R16 300 ohms R17 1 500 ohms R18 R19 300 000 ohms R20 5 000 ohms R21 500 000 ohms R5 R6 47 ohms A watt R22 2 000 ohm potentiometer R23 R24 1 000 ohm potentiometer RS1 RS2 Eight 10 000 ohm resistors in single inline package Miscellaneous DISI LM24013W LCD display Sharp Electronics S1 S5 Spst momentary action push button switch S2 S3 S4 Four position DIP switch SW 1 Dpa2t slide switch SW2 SW3 Dp3t slide switch Note The following items are available from Netronics R amp D Development Ltd 333 Litchfield Rd New Milford CT 06776 203 355 2659 Complete kit of parts for the single channel DSO including pc board 199
26. ELECTRONICS amp COMPUTER EN THUSIAS TS JANUARY 1991 FEATURES 12 The Modern Electronics 32 36 52 54 56 66 72 7 8 Nm QO 1 O un Computer Experimenter Lab Part 1 Build a 200 Digital Storage Oscilloscope that serves as the foundation for a complete experimenter s lab Bv Martin Meyer The Watt Watcher Inductive pickup meter monitors instant ac power usage so you car more efficiently manage your energy consumption By Dennis P Blum Schematics for Your PC Part 2 A close look at popular schematic capture programs TJ Byers Power Supply for IC Experimenting AC operated dc power source can be used for powering small low power circuits and projects By Walter W Schopp Code Practice Oscillator Helps beginners learn to send Morse code By Charles D Rakes COLUMNS Electronics Notebook Experimenting with Crystal Oscillators By Forrest M Mims III PC Capers Compact Disk Technology and Computers By Ted Needleman Solid State Devices Serial Number Chip Melody Makers Silicon Pressure Sensor and Free Selection Guide By Joseph Desposito DEPARTMENTS Editorial By Art Salsberg Letters Modern Electronic News New Products Books amp Literature Advertisers Index 2 s 7 s 4 o VOLUME 8 NUMBER 1 72 i n i u l s n I A Z ME w fi rit um i BI ores 12 January 1991 MODERN ELECTRONICS 3 TTL Cookbook
27. Each chip is registered and test ed before shipping Melody Circuits LSI Computer Systems 1235 Walt Whit man Rd Melville NY 11747 has intro duced the LS3404 series of melody cir cuits These are monolithic ion implant ed MOS circuits designed to generate music The circuit is mask programma ble and can hold 255 notes in PROM Pitch has a 0 8 resolution for notes up to 2 kHz and 1 3 for notes up to 3 kHz Note duration ranges from 125 milliseconds for a th note to 2 0 seconds for a full note This is equivalent to 120 beats per minute A duration counter permits eight note durations out of a possible 16 A pitch counter allows for 15 different pitches out of a possible 511 pitches The output of the pitch counter is con ditioned by an external R C envelope to provide proper envelope decay and is ap plied to a pair of operational amplifiers that drive a piezoelectric speaker in a push pull configuration Only one out put is used for driving an external transis tor dynamic speaker combination in a single ended configuration see Fig 2 The exponential decay envelope imposed on each note provides a realistic effect to sound quality Upon application of a supply voltage power on reset causes a small time delay 8 6 15 LS3404 9 VDC allg 0 1 uF o HJ 2 3 14 2N2222 PEL 8n 100 MW SPEAKER Fig 2 Only one output of the LSI Computer Systems LS3404 melody chip is used for
28. Mobile Antenna 15 coax MA100 25 00 Cigarette Lighter power adaptor CP100 4 00 External Speaker with mobile mount MS100 19 50 Extended Warranty 2 3 yrs 40 55 Specifications Coverage 27 54 108 174 406 512 830 950MHz Sensitivity 4uV Lo Hi 8uV Air 5uV UHF 1 0uV 800 Scan Speed 15 ch sec IF 21 4MHz 455KHz Increments 10 12 5 25 30 Audio 1W Power 12 8VDC 200MA Antenna BNC Display LCD w backlight Dimensions 21 4H x55 8W x 6 1 2D 140z wt We offer 100 s of communications products 30 MODERN ELECTRONICS January 1991 Say You Saw It In Modern Electronics AR2500 499 2016 Channels 1 MHz to 1500 MHz Standard Features Continuous coverage AM FM wide band FM amp BFO for SSB CW 64 Scan Banks 16 Search Banks RS232 port built in e Includes AC DC pwr crd Antenna Mntng Brckt One Year Limited Warranty Options Earphone EP200 2 00 External Speaker Mobile Mount MS190 19 50 Extended Warranty 2 3 yrs 65 75 Mobile Mounting Bracket MM1 14 90 RS232 Control Package SCS2 295 00 software amp cable offers spectrum display and database Specifications Coverage 1 MHz 1500MHz Sensitivity 35uV NFM 1 0uV WFM 1 0AM SSB CW Speed 38 ch sec scan 38 ch sec search IF 750 00 45 0275 5 5MHz 455KHz Increments 5 112 525 KHz Audio 1 2 Watts at 4 ohms Power Input 13 8 V DC 300mA Antenna BNC Display LCD backlighted D
29. Month s amp Year s Number ordered 3 50 each NAME ADDRESS CITY Total Payment Enclosed 78 MODERN ELECTRONICS January 1991 ger level control operation is via pushbutton switches The LED dis play consists of 7 digits LED indi cators are provided for function se lected gate time selected MHz ms and kHz ys selected gate and over range Input connections are made via BNC connectors A carrying han dle doubles as a tilt stand for bench top use 595 CIRCLE NO 17 ON FREE INFORMATION CARD Component Tester A hand held component tester de signed for field service and general in dustrial applications is available from B amp K Precision The Model 815 tests capacitance and resistance in a variety b lt B gt aA of components and tests transistors SCRs diodes LEDs and batteries x Capacitance range is 0 1 pF to 20 pF for testing capacitors cables switches and other components Accuracy ranges from 75 to 1 5 Resis tance range is from 0 1 ohm to 20 megohms Transistors are tested by measuring hy gain and Ij leak age values and batteries are tested under load for voltage output Test results are displayed by a 0 8 inch tall 3 digit LCD numerals A tilt stand test leads and component insertion sockets accompany the tester 99 CIRCLE NO 51 ON FREE INFORMATION CARD 1 Say You Saw It In Modern Electronics MART Cla
30. No Illinois orders Z 708 658 2121 Hours 8 00 am 5 00 pm central time 4 9 49 a PRESENTING x dx d CABLE TV DESCRAMBLERS 4 9 44 STARING 9 9e e 4e o JERROLD HAMLIN OAK AND OTHER FAMOUS MANUFACTURERS e FINEST WARRANTY PROGRAM AVAILABLE e LOWEST RETAIL WHOLESALE PRICES IN US e ORDERS SHIPPED FROM STOCK WITHIN 24 HRS e ALL MAJOR CREDIT CARDS ACCEPTED FOR FREE CATALOG ONLY 1 800 345 8927 FOR ALL INFORMATION 1 818 709 9937 PACIFIC CABLE CO INC 7325 RESEDA BLVD DEPT 1206 RESEDA CA 91335 Be anFCC LICENSED ELECTRONIC TECHNICIAN aS A A AAs PE 14 Earn up to am 30 an hour and more NA 4 Eo e S Learn at home in spare time Ath No previous experience needed No costly school No commuting to class The Original Home Study course prepares you for the FCC Commercial Radio telephone License This valuable licenseis your professional ticket to thousands of exciting jobs in Communications Radio TV Microwave Maritime Radar Avionics and more even start your own business You don t need a college degree to qualify but you do need an FCC License No Need to Quit Your Job or Go To School This proven course is easy fast and low cost GUARANTEED PASS You get your FCC License or money refunded Send for FREE facts now MAIL COUPON TODAY COMMAND PRODUCTIONS FCC LICENSE TRAINING Dept 206 P O Box 2824 San Francisco CA 94126 Please rush FREE de
31. Oscillator This simple electronics project is useful in helping beginners learn to send Morse code By Charles D Rakes n aspiring amateur radio op erator has two distinct ave nues in preparing for his ham license One is to learn and under stand the fundamentals of amateur radio theory and operating pro cedures and FCC Rules and Regula tions The other is to learn how to re ceive and send International Morse Code Neither is very difficult given the right attitude and appropriate text and other materials Even though there promises to be a no code license in the near future not being able to meet Morse code requirements for a license class beyond it locks you out of working a lot of frequencies such as 2 meter FM There are a number of excellent tapes and books available for learn ing theory and code However unless you have a code practice oscillator CPO and telegraph key you re going to have difficulty learn ing how to send the dits and dahs that make up the code In this article we ll show you how to make a prac tical code practice oscillator that can be used with a key and headphone About the Circuit The heart of our Code Practice Os cillator is a piezoelectric sound gener ator shown as PBI in the schematic diagram These buzzers are also com monly called piezoelectric ceramic buzzers or simply piezo sounders by vendors Select the kind that has the drive circuit built into it and has a pleasa
32. Other attributes of the new MPX5100D includelow cost and miniature size Some typical applications are in industrial consumer automotive and biomedical products where pressure monitoring or closed loop control is desired The MPX5100D sensor is priced at 45 in quantities over 100 Selection Guide on Disk Motorola 2100 E Elliot Rd Tempe AZ 85284 has a new version of its free data disk called the Motorola Elec tronic Selection Guide This floppy res January 1991 MODERN ELECTRONICS 73 Say You Saw It In Modern Electronics SOLID STATE DEVICES ident database allows design engineers to rapidly search Motorola s entire semi conductor product offerings and select the best device for an application The Motorola data disk provides information for more than 13 000 Motorola ICs and components in 124 product categories and also contains cross references to over 25 000 competitive devices The data disk is now available in both IBM and Macin tosh formats The data disk is a menu driven pro gram that permits users to perform para metric searches across Motorola s semi conductor product line Users can locate devices by entering values for parameters that are important to their applications After these values are entered a single keystroke displays every Motorola device that meets these requirements with the absolute best device for the specified ap plication always listed first Device number
33. Storage Oscilloscope we have de veloped for your personal assembly works e Display The liquid crystal display LCD panel used in this project con sists of 15 360 dots or cells arranged in a 64 by 240 dot matrix The dots are individually addressed to pro duce the display The LCD display see Fig 1 is actually a very simple device Five signals produced by the microprocessor control the entire process The first step is to issue a SCAN START pulse This signals the display that we are going to start at row one Next using the DATA CLOCK in put the display data for the entire first row is shifted into the display s shift register This register holds the information for an entire row 240 dots Then the CPU issues a DATA LATCH pulse that transfers the data in the registers to the liquid crystal cells in row 1 If the data in a display cell is a logic 1 the cell polarizes the crystals darkening the screen at that point The negative voltage supplied to the CONTRAST terminal sets the level of polarization and thus the contrast If the data is a logic O the cell remains at the background color The DATA LATCH signal also in dexes the display s internal row counter to the next row The CPU then fills the display s shift register with the data for the second row of Say You Saw It In Modern Electronics L SX 29 WOM H31SAS ggg bah JUS C352 1 v19q5 ed 22 0 g 5800
34. TIMER DISPLAY SCREEN 3 SEC FREEZE MODE at 4 3 ala x DIO WE GET TRIG e ala Q YES READ DATA RAM AND FORMAT DISPLAY RAM DIO HE GET A FREEZE TL YE SET FREEZE MODE THEN GO TO START NZ Fig 10 Software details for simple program required for project setting up a stack pointer and initial izing the 8155 ports and timer Next it fills the display RAM area with Os to clear the screen and the data to add the display s grids The program then looks at the va rious mode switches to set up for dis play of Channel A Channel B both or the logic analyzer Additionally it concludes if you set up in the Single Sweep or Normal mode If Single Sweep is selected the program dis plays the cleared screen and waits for you to press the ARM FREEZE button While it is waiting the CPU is con stantly refreshing the screen Once you press the ARM FREEZE button the system is armed and awaits a val id trigger When the trigger arrives the counter starts generating data RAM addresses and stores data being col lected in data RAM During the col lection time the LCD display is still being refreshed When data RAM p a a U UO M a has collected 256 slices of data the address generator signals the CPU that it is ready to be read The CPU responds by stopping everything to read the data RAM It then formats data collected and places it in the pre viously cleared display RAM area Now
35. The netlist format is SuperCAD s own atranslator for PC design work from a company cooperating with Mental Automation is included Al so an optional utility 49 is offered that supports half a dozen or so pop ular formats Hard copy printout is of good quality but you have no control over the printer or the size of the schemat ic on the page which means you may end up taping more than one sche matic together Plotters and laser printers aren t supported but the op tional utilities that were cited are available for these purposes For its price SuperCAD is surpris ingly capable The program is full featured and easy to learn and use We recommend it highly for entry level schematic capture work CIRCLE NO 28 ON FREE INFORMATION CARD et a E T u o o o Vc o Tango Schematic Series HI from Accel Technologies Tango Schematic is an extremely versatile 495 schematic capture pro gram Happily it doesn t have a steep learning curve and is fairly easy to use It comes with a large compo nent library and has exceptionally good printer hard copy control You ll need 5MB of free disk space plus 1MB of LIM compatible RAM to use it though The component library consists of more than 11 000 devices spread among 23 library modules and in cludes military as well as commercial TTL devices in both DIP and sur face mount packages However sev eral thousand parts are duplicated among the modules each with the same bo
36. Way Redmond WA 98052 206 882 8080 The Electronic Whole Earth Catalog 149 Broderbund Software Inc 17 Paul Dr San Rafael CA 94903 800 521 6263 CD 7 ROM Macademic ROM 99 149 Quantum Leap Technologies Inc 314 Romano Ave Coral Gables FL 33134 305 446 2477 beat If you have a Mac and a CD ROM player the CD 7 disk is a good way to boost your software collection And with commercial educational software run ning 35 to 50 a package and more the 149 Macademic ROM is a real bargain Next month we ll take a look at some other CD ROM applications and pro gram collections this time for PCs ME 2 catal hard to FLECTARON TC S Get two of the most valuable electronic catalogs ever These s contain over 16 000 ind electronic parts amp equipment VOL 112 pages of high quality test equipment VOL Il 144 pages of parts tools amp cross references Send 5 check or money order or call today amp use your V SA or MasterCard 1 800 543 3568 CONSOLIDATED ELECTRONICS INCORPORATED 705 WATERVLIET AVENUE DAYTON OHIO 45420 2599 FAX 11513 252 4066 TEL 1 51 1 282 5662 TELEX 288 229 COMPUSERVE 76057 3347 EASYLINK 62850013 I teatures features electrononic CIRCLE NO 83 ON FREE INFORMATION CARD Wil SOLID STATE DEVICES Serial Number Chip Melody Makers Silicon Pressure Sensor and Free Selection Guide By Joseph Desposito
37. all of the resource goodies Microsoft s Office probably wouldn t be my first CD ROM purchase though A public domain shareware disk such as the CD 7 ROM reviewed a bit further on makes more sense to me but I do use a number of Microsoft applications If the Office s collection will be suitable for your needs the CD ROM is probably a good deal The Electronic Whole Earth Catalog Certain things every certified informa tion addict just has to have An informa tion addict is someone who collects infor mation just to have it Whether or not he actually has a use for the information or will ever put it to use is beside the point it s just fun knowing If you ve ever been accused of being a repository of use less information welcome to the club and take comfort in knowing you re cer tainly not alone There s another way to recognize an in formation addict by the copy of one of The Whole Earth Catalogs on his book shelf The Whole Earth Catalog for those of you too young to remember was an Oversize paperback first published in 1969 which was subtitled Access to Tools And that it was a compendium of reviews and short pieces whose pur pose was to point you in the right direc tion for collecting information The Catalog put together by Stuart Brand and his merry band of data freaks wasn t an elegant book but boy was it fun to read Published sporadically dur ing the Seventies and early Eighties I
38. and a real tirae clock mounts piggy backed on any GORDOS GSC series serial control lers for local process control A BASIC program running in the unit communicates commands to one or more GSC controllers and other serial devices connected to its RS 422 485 port The engine is pro grammed from a PC in BASIC or as sembly language and can be used to make decisions based on analog and or digital signals relayed to the con troller Its interpreter uses standard BASIC commands Applications programs can emu late various network protocols to permit operation with existing soft ware The engine can enable output devices in response to analog and dig ital inputs It can also read input counters pulse and sequence outputs pulse width modulate dc sources switch stepping motor phases for speed and direction and output ana log process currents A utility program provided on disk runs on an IBM PC or compati ble computer to establish direct key board communication with the en gine Commands entered via the PC keyboard are communicated to the engine and appear as standard text on the video display The program also provides a means to upload and download BASIC programs from disk files CIRCLE NO 16 ON FREE INFORMATION CARD Order Back Issues of Ul Ham Radio Bookstore Main St Greenville NH 03048 0498 Ii EecrROwcs 800 457 7373 ORDER FORM Please send me the following issues 3 50 each
39. and noise into the ana log channels Be sure to locate the transformer away from the analog inputs to avoid any stray electrical fields and noise Program Software Software required for this project is basically very simple The tasks are illustrated in Fig 10 Whenthesystem is turned on or RESET Switch S Fig 2 is pressed the CPU starts at the be ginning of the task list First it per forms a bit of system management ADDRESSES GENERATEO BY THE ADDRESS GENERATOR ARE DELAYED TO PROPAGATION DELAYS AD CLOCK ADDRESSES INCREMENT ON FALLING EOGE RAM WRITE ORTA RAM WRITES ON RISING EOGE AD CLOCK CTO A TO D CONVERTER OaTA VALIO AT OUTPUTS OF A TO O ON RISING EDGE AOORESS LINES f i DATA RAM READS ADDRESSES GENERATEO BY THE ADDRESS GENERATOR ARE OELAYEO DUE TO PROPAGATION OELAYS CS FXN AODRESS INCREMENTS ON FALLING EDGE READS DATA RON CFROM CPU TO CPU Fig 9 Timing details for data RAM writes and reads Say You Saw It In Modern Electronics January 1991 MODERN ELECTRONICS 27 OL s URN Er OISPLAY SCREEN ARM FREEZE MODE SET RESET POWER INITALIZE STACK DO RIO TEEN LOGIC A ANALIZER SINGLE SINGLE SWEEP OR NORMAL SWEEP ON RIGGER ENABLE NORMAL DIO WE GET TRIGGER s LRL READ DATA RAM AND FORMAT DISPLAY DATA SET ARMEO STATUS OFF GO TO START TO DISPLAY DATA AND WAIT FOR ARM FREEZE BUTTON BOTH OR 81565 I O amp
40. and other chemi cals For more information about quartz crystal mass detectors see In Situ Inter facial Mass Detection with Piezoelectric Transducers by Michael D Ward and Daniel A Buttry in Science August 31 1990 pp 1 000 through 1 007 Piezoelectric Effect In 1880 Pierre and Paul Curie found that a voltage is produced when pressure is ap plied to crystals of quartz tourmaline and Rochelle salt The following year they discovered that applying a voltage to these same crystals caused them to ex pand or contract The name assigned to these phenomena is the piezoelectric ef fect and is taken from the Greek word piezein which means to press Certain ceramics and plastics also ex hibit the piezoelectric effect Indeed many kinds of electronic devices have been designed around these newer piezo electric materials They include solid state buzzers speakers fans motors spark generators and various kinds of QL 2N 2646 284891 ETC Fig 2 Schematic of a crystal controlled unijunction transistor oscillator 56 MODERN ELECTRONICS January 1991 Say You Saw It In Modern Electronics Fig 3 Schematic of a simple CMOS crystal oscillator circuit Fig 4 Schematic details of a wide range crystal controlled clock generator circuit movement and vibration sensors In spite of these new materials crystals of quartz remain the most important piezoelectric material The operation of a
41. enclosure which is usually made of metal The external electrodes can be either wires for direct installation in a circuit or pins for inser tion into a socket For many years quartz crystals were made as discrete components They re still made that way today but are usually housed in much smaller packages such as those shown in Fig 1 They re also avail able in tiny surface mount packages Some discrete quartz crystals can with stand exceptionally high mechanical loads For example Motorola makes a line of ultra miniature crystals that mea sure 0 12 inch 3 mm in diameter and RE ENABLE VISAS to ICM12093 0 33 inch 8 4 mm long These tiny crys tals can withstand a shock of 8 000g Hybrid Oscillators A comparatively recent development in the long history of the quartz crystal os cillator is the incorporation of miniature quartz crystals into various kinds of hy brid microcircuits such as those used in precision oscillators and digital watches Most of these units have a fixed frequen cy TTL and CMOS compatible outputs Some incorporate a screwdriver adjust able slot that permits the oscillator s fre quency to be slightly adjusted Hybrid oscillators are available with a frequency range of from a few hundred kilohertz to 200 MHz Their frequency stability varies from 100 to x 1 000 parts per million For even better stability temperature controlled hybrid oscillators sometimes called OCO
42. experimenter s lab To be followed by an analog function generator then a digital signal generator that produces up to 20 different simultaneous digital signal trains from a built in library of experiments or from programs downloaded from an IBM PC or compatible Plus ongoing experiments for all experimenter levels By Martin Meyer lectronics and computer tech E nologies have become more complex than ever before Nevertheless we can still experi ment design products and learn how the newest technology works on a personal basis if we have the right equipment Even on a kitchen table As we know digital electronics and the microprocessor have com bined to change and add extra excite ment to the art of product develop ment whether as general purpose microcomputers or as dedicated ap plication microcontrollers The proj ect presented here initiates a new se ries by Modern Electronics The Modern Electronics Computer Ex 12 MODERN ELECTRONICS January 1991 perimenter Laboratory that will help you to quickly understand and implement the wide range of new electronic and computer develop ments constantly being introduced We start here with a digital storage oscilloscope that will serve as part of the underfooting of an exhilarating electronics computer learning expe rience An optional add on eight Say You Saw It In Modern Electronics January 1991 Project channel logic analyzer is a
43. extremely corrosive hydrogen chloride gas that can destroy electronic equipment even several floors away The gas is emitted before PVC burning takes place The new device uses an inexpensive quartz crystal coated with zinc that s set to vibrate at a certain frequency The zinc metal corrodes when hydrogen chloride gas hits it forming zinc chloride which rapidly absorbs water from the alr This causes the quartz crystal to change its vibration frequency which sets off an alarm before flame or smoke occurs BRIGHT WHITE LED Ledtronics s Torrance CA new WhiteLite LED is said to be the industry s first multi chip white LED 100 brighter than present amber yellow technology It s intended to be an incandescent lamp replacement for the world most popular color and can be used to re lamp pushbuttons backlights and control panel indicators It s an electrical and mechanical duplicate of the incandescent lamp it replaces and will not cause neat damage to lenses which might be colored red orange among others LEDs can be expected to operate at least 100 000 hours compared to an approximate 4000 hours for incandescents which makes them very cost effective In 1000 quantities they re priced 2 to 3 each depending on base style ordered SECURITY ROBOTS Cybermotion Inc s Rcanoke VA new mobile security robot is based on the company s Navmaster mobile robot with the addition of a special Security Patrol Instrumentation package that a
44. graphics This Works demo can be found in the Microsoft Products folder inside the Resources folder on The Microsoft Office CD The demo cea be run directly from the CD by double clicking on the Microsoft Works Autodemo HyperCard stack Hold down the Option Key for Butten Explanations The Electronic Whole Earth Catalog ets you browse through a HyperCard stack that contains information resources on a wide variety of subjects tionale behind The Whole Earth Catalog was that it was and is important that you be able to fiad out where to go when there s somethiag you want to know about I found this rational and the ap proach the Catalog took to be irresistible and I m sure that a lot of you would also The last paper version of the catalog The Essential Whole Earth Catalog was published in 1986 With the computer as one of the ultimate information machines it makes a lot of sense that one of the first CD ROMs for the Macintosh was the electronic version of The Whole Earth Catalog published this time around by Broderbund Software Inc The Electronic Whole Earth Catalog now subtitled Access to Tools and Ideas is a set of almost 9 500 Hyper Card cards Though organized a bit dif ferently from the paper version it con tains many of the same things that en deared it so from the Catalogue s first 1969 publication These include short to the point commentaries and reviews as well as the sense cf no B S honesty tha
45. is also supported with an notation starting at the upper left section of the schematic and sweep ing to the lower right corner in a rast er pattern Parts that have previously assigned references aren t changed and their references aren t dupli cated However references manual ly assigned during part placement or editing aren t checked for duplica tion Each device has two reference lines which can be edited for text and position but not font size A wire is drawn by clicking the mouse button once to start the line and clicking it a second time to place the line and change its direction You can also draw 45 degree diagonals in the ortho mode Tango Schematic has no pan func tion Instead the infinitely variable Say You Saw It In Modern Electronics EO zoom is used to place the work area of interest on center stage Unfortu nately this doesn t help with place ment of long wire runs because the small zoom magnification needed to view an entire sheet makes wire align ment difficult Tango has three grids an absolute grid that s immovable an invisible grid snap reference grid that can be moved with relationship to the first and a visible grid that can t be turned off but can be toggled between a dot and a hatch pattern Dot spacing for each grid pattern is individually programmable Editing features are excellent with move delete and find among the many editing options offered for sin gle objects bl
46. is installed in an eight pin mini DIP It s designed to be oper ated over a frequency range from 2 MHz to 10 MHz The chip is designed to be powered by a TTL supply or no more than 6 volts and it can drive up to 5 TTL loads Rise and fall times of the square pulses delivered by the ICM7209 are around 10 nanoseconds in duration The oscillator portion of the ICM7209 is simply an inverter as in Fig 3 fol lowed by a buffer stage to prevent load ing down the oscillator Also included is a divide by 8 circuit that provides the sec ond output Another feature is an enable SS r rs January 1991 MODERN ELECTRONICS 59 Say You Saw It In Modern Electronics No other training anywhere shows you service computers Only NRI walks you through the step by step assembly of a powerful AT compatible computer system you keep giving you the hands on experience you need to work with troubleshoot and service all of today s most widely used computer systems y V With NRI at home training you get everything you need to start a money making career even a computer service business of your own No doubt about it The best way to learn to service computers is to actually build a state of the art computer from the keyboard on up As you put the machine together performing key tests and demonstrations at each stage of assembly you see for yourself how each part of it works what can go wrong and how you
47. once to start the wire and again to stop it However each wire is a single entity which means you can t have continuous runs You must end one wire then be gin the next at the termination point for continuous runs Snap to grid and object snap are both supported There s no autopan Instead scrolling is done by using scroll bars at the right side and bottom of the screen or by using the keyboard s page up page down and arrow keys In fact keys play an important part in drawing and editing of the schematic and in several cases there s no mouse equivalent of a keystroke Editing features are excellent with move copy delete change replace and find available for both single ob jects and blocks There s also a de sign checker that points out drawing mistakes Zoom however leaves a lot to be desired offering only two levels a full view of the worksheet and normal Each of these functions can be called up by simply clicking on the menus that border the screen SuperCAD features automatic bus generation where you need only type abus name and a few bits of informa tion to make the software automati cally draw connecting lines and sig nal names Macros can also be load ed to improve operating efficiency The program has an excellent con text sensitive on line help screen that tells you all you need to know about using the program This is welcome because the 55 page user s manual is pretty sketchy in some areas
48. panel mount audio taper potentiometer Misc Suitable enclosure see text snap connector and clip for B1 control knob for R1 lettering kit clear spray acrylic machine hard ware hookup wire solder etc place R with a similar wire that goes to the two points this potentiometer normally occupies Machine the enclosure as needed If you plan on mounting the buzzer inside the enclosure drill a 4 inch diameter hole in its mounting location so that aligning the hole in the buzzer housing with the drilled hole allows the sound to escape Mount the components in their various locations and wire them together according to the schematic diagram Make certain that you pro perly polarize the battery and buzzer When you finish wiring the circuit label J PHONES and J2 KEY If you use dry transfer letters protect the legends with two or more light coats of clear acrylic spray Allowing each coat to dry before spraying on the next Now all that remains for you to do is snap in a fresh battery connect your telegraph key adjust the vOL UME control for a pleasant level and begin practicing Say You Saw It In Modern Electronics They re Here You ll want these two exciting proj ect books packed with complete plans for building a wide variety of useful electronic devices The First and Second Books of Modern Elec tronics Fun Projects both Howard W Sams publications are now available You ll find a
49. quartz crystal re sembles that of the parallel LC circuit shown schematically in Fig 1 A princi pal differenceisthat the Q of the crystal is considerably higher up to 100 000 This means the frequency stability of a crystal controlled oscillator is exceptionally high Temperatureis the major enemy of fre quency stability in quartz crystal oscilla tors Temperature changes cause the di mensions of the crystal to be slightly de formed thereby altering ever so slightly its resonant frequency The change isn t catastrophic If it was you wouldn t be able to use a portable CB or ham rig on a cold day unless you first retuned its oper ating frequency For ultra precision applications in which the frequency of an oscillator isn t to vary more than a few parts per billion the quartz crystal or even the entire oscil lator is installed in a miniature oven that heats the crystal to a uniform tempera ture above the highest expected ambient temperature Oven temperature is care fully regulated The piezoelectric effect is greatly influ enced by the geometry and orientation of the material that exhibits it While natur al quartz can be used to make quartz crystal resonators today most are cut from artificially cultured quartz crystals The crystal slices are cut lapped and pol ished to the precise dimens ons necessary to achieve the desired resonance Elec trodes are then applied and the crystal is mounted in a protective
50. series of commands before they become a usable logic element An assembly language program is required to implement this chip If BASIC or another high level lan guage were used in this design you would have to integrate the equiva January 1991 MODERN ELECTRONICS 17 EE Li aa H El Ge LITE IS 42 45 LOGIC ANALYZER INPUTS Laci oma BR Fig 4 Circuit details for connection of optional logic analyzer inputs lent of an assembly language routine in your program to deal with initiali zation and use of the features in this integrated circuit Since integrated circuits have a growing number of such embedded functions the need to know at least some assembly language program ming becomes increasingly evident So if you have avoided the subject in the past you should seriously recon sider learning it now In the real world you handicap your hardware capabilities without knowledge of as sembly language programming The digital signal generator article that will follow soon will offer an oppor tunity to learn and practice the basics of assembly language programming on an 8088 CPU and associated peripherals Getting back to the 8155 the pro gram initializes Port A as an input port This port is connected to the va rious display mode switches The program reads this port and decides if the system is in the single sweep mode in displaying the eight channel logic analyzer analog Channel A Cha
51. split ring and regular 340 IF BITS 0 THEN BITS 1 DEC DEC 32 ELSE BITS 0 DEC 590 DEC 32 350 GOTO 390 360 IP BIT6 0 THEN BIT6 1 DEC DEC 64 ELSE BIT6 0 DEC DEC 64 CALL 370 GOTO 390 380 IP BIT 0 THEN BIT 1 DEC DEC 128 ELSE BIT7 0 DEC TOLL FREE DEC 128 390 BYTES ww BYTES BYTES STRS BIT7 STRG BIT6 us nicam FREE CATALOG 400 BYTES BYTES STRS BITS w STRS BIT4 T 410 BYTES BYTES STRS BIT3 STRS BIT2 420 BYTES BYTES STR BIT1 STR BITO 1 800 338 0531 430 OUT 888 DEC LOCATE 14 28 PRINT BYTE GOTO 150 CIRCLE NO 81 ON FREE INFORMATION CARD rs Tsats 6 MODERN ELECTRONICS January 1991 Say You Saw It In Modern Electronics BI MODERN ELECTRONICS NEWS illl COMPUTERIZED CHESS TRAINING World chess champ Garry Kasparov trains with an Atari MEGA 2 computer He and his coach store chess moves made by tournament players in a database program which is run to analyze strengths and weaknesses of other players Prior to this trainers had to manually clip and sort through articles on matches played throughout the world NEW RESEARCH DEVELOPMENTS Bellcore researchers developed a unique low cost prototype device that detects fires involving polyvinyl chloride PVC before there s smoke or even heat When PVC which is a common cable and wire insulation material overheats or burns it produces the
52. the data collected is displayed on the screen In Single Step mode the data is displayed until the ARM FREEZE button is pressed again The program constantly checks to see if you pressed the button or if you changed your mind and switched to another mode If you selected the Normal mode much the same occurs except that collected data is displayed for only 0 3 second at a time If during that time a valid trigger occurs and differ ent data is collected the CPU collects that data and places it in the format required by the display Display off timeis about 25 ms During this time the CPU reads the data RAM and re 28 MODERN ELECTRONICS January 1991 formats the display RAM This re sults in a slight blinking of the dis play The program constantly waits to see if you pressed the ARM FREEZE button which freezes the current dis play This action eliminates the blinking If you again press the ARM FREEZE button the trigger is re en abled and the scope continues to cap ture and display new data Testing the Scope After assembling the DSO from plans presented in this article here are the steps you should follow to test the instrument 1 Set TRIGGER MODE to NORMAL 2 Set trigger coupling to AC 3 Set TRIGGER SLOPE to or 4 Set TRIGGER GAIN to maxi mum and TRIGGER LEVEL to center of rotation 5 Set RANGE to IV DIV 6 Set INSEL to AC Say You Saw It In Modern Electronics D
53. the enclosure ground for safety reasons Construction AS you can see in the schematic dia Say You Saw It In Modern Electronics gram this is a very simple circuit de sign All its components are fairly small in size making it ideal to build the circuit on a small piece of perfor ated board using the point to point wiring technique Alternatively you can design and fabricate a printed circuit board on which to mount and wire together the components Wire the circuit on whichever type of board you choose according to the schematic If you wish you can sub stitute an integrated full wave bridge rectifier assembly for rectifier diodes DI through D4 If you make this sub titution use a rectifier assembly rat ed at 1 or more amperes Once the circuit board assembly is fully wired and an ac line cord has been attached to it connect the com mon lead of a dc voltmeter or multi meter set to the dc volts function to the negative lead of C2 or C3 Place the assembly on a nonconduc tive surface and plug the line cord into a nearby ac outlet When the board is powered potentially lethal ac line power is present at the input SO practice extreme caution when probing the circuit With power applied to the circuit touch the hot probe of the meter to the cathode lead of zener diode D5 and note the reading obtained It should be positive in polarity and within a few tenths of a volt of the specified rat
54. them to be very similar in both features and operation And while there are num erous features that I haven t yet gotten around to trying I can t see there being much besides animation that PowerPoint won t let you accomplish in the way of making up a presentation The last application of the four Micro soft Mail is a great application if you are running Apple s AppleTalk network and useless if you aren t Mail gives you the capability of sending messages docu ments or spreadsheets to anv other user connected to your network As network mail packages go MS Mail is one of the easiest to use and offers most of the fea tures for network communication you might want However if you aren t net working a bunch of Macs or if your net work is not very disbursed MS Mail is going to be of limited or no value to you In putting together this ROM Micro soft was able to include an astonishing collection of additional packages and utilities which the company calls re sources This collection greatly en hances the usability of the four core ap plications but many are useful beyond their use with the Microsoft packages While the list of these resources is too extensive to reproduce here some of the contributions from other vendors in clude a collection of more than 350 screen fonts from Adobe which of course gives you a good idea of what the type faces look like but are of limited value unless you ve recei
55. thento take the most di rect route to the location in your basement or elsewhere where your main fuse box is located Having selected the wiring route to take determine how long must be the bell wires Add 6 feet to the measured length and cut the wires to the length needed Run the wires along the route using thumbtacks to secure them into place wherever possible At the remote end temporarily connect the wires to the leads of the inductive pickup assemblies wiring the latter in series with each other by twisting together the wires Do not solder any connections Installation of the pickups is sim ply a matter of placing the two sec tions of each assembly around the high side conductors in your electri cal service fuse box as illustrated in Fig 4 Do not use the ground wire when doing this Before you proceed with this por tion of installation keep firmly in mind that any work done inside the fuse box can be potentially lethal even though you will be making no direct electrical connections to the ac line Work carefully and touch only the insulated mains conductors When installing the pickups strive for a zero gap in the magnetic cir cuits or as near to it as you can get This will assure maximum sensitivi ty Usea cable tie at both ends of the assembly to secure it in place and foam rubber between the assemblies z1 c z tag um k p Fig 3 All components except pickups mount dire
56. to room remote control An exclusive APR Automatic Precision Recep tion system continuously monitors the FM signal and adjusts critical tuner mode sensitivity and high fre quency blend to provide optimum performance Direct Access Tuning punching in a desired station fre quency from a front panel numeric keypad and Classified Memory Pre set permit each of the tuner s 40 AM FM station presets to be assigned to any of six classes These classes can be assigned by type of music pro gramming or according to any other scheme Pressing a button gives a brief sample of each station in the selected class A professional AppleTop Bus ported control system for all models of Mac Y vg T ANN Cosa Me ee lt n a n i NS LEN ENT oL DUE T ga x MSN Seven inputs are available with audio video switching and dubbing facilities that enable them to serve as the core of a sophisticated A V sys tem Standard rotary bass and treble controls are augmented by a slide type Selective Tone Loudness con trol that progressively boosts very low and very high frequencies in bal anced proportion to maintain a tonal balance when listening at low volume Other features include a sleep tim er Onkyo s slide control in the Dy namic Bass Extender circuit that per mits adjustment for fuller low fre quency reproduction and a Stereo Image Expander A large fluorescent display shows tuned frequency memory preset sel
57. to obtain e g tara Comes and aom Available for qualified businesses rinlers Okidata Epson HP Lasers an a square wave others ot huge discounts fd ot oh anor Lara qe iem If you do not havea signal ae PARTS amp BOARD REPAIR professionals are adding computer repair to tor connect the scope input to pin 4 Single source for parts and board repair their businesses or starling their own com of U16 Set the timebase to 20 ps div 24hour express turnaround puter repair businesses The input will be approximately 5 Call Tech Serv at 212 967 1865 now volts To reduce the input voltage as tech AUTHORIZED DEALER required in the following steps con ser nect a 2 000 ohm variable resistor sap ata IN V GNIS ON ACAS from pin 4 of U16 to ground Con 1989 Tech Serv Corp 253 West 28th Steet New York NY 10001 nect the wiper to the scope input CIRCLE NO 8 ON FREE INFORMATION CARD Then adjust the resistor to center dis plays for the rest of the adjustments LEARN ELECTRONICS FROM VHS VIDEO TAPES To make sure that you have the ac drive signal at the display set the RANGE Switch to 1V DIV and connect the scope input to pin 3 on the dis play Then set the timebase generator to 5 ms div You should see a square wave with a 40 millisecond period in the display 1 Our Video Tapes The only other adjustment is for Are Designed vertical sensitivity CAL control K23 1 To Make Learning Electronics This c
58. ugs 4 Te 1 F 4 a I 73 5 Fu CABLE DESCAAMBLERS OAK M3568 COMBO 39 95 Jerrold Zenith Hamlin Sci Atlanta Pioneer amp MORE OUR PRICES ARE BELOW WHOLESALE CABLE PLUS 14417 Chase St 481 C Panorama City CA 91402 1 800 822 9955 e Other Info 1 818 785 4500 NO CALIF SALES DEALERS WANTED CABLE TV DESCRAMBLERS ALL TYPES 800 582 1114 FREE CATALOG M K ELECTRONICS 7958 Pines Blvd Suite 276 Pembroke Pines FL 33024 Avadable in the telephone or small plastic case LEARNING Electronics Troubleshooting Basic Electronics Simulations and Problems program can help PC MSDOS 32 95 EES MEI POB 1391 Lubbock Texas 79408 BUILD from easy to follow schematics audio mixers equalizers stage studio business home basic to sophisticated feedback con trollers active filters guitar super fuzz box loudspeaker enclosures including car van power supplies more vSSE reliability Send 5 00 for descriptions Reasonable prices von Sprecken Sound Engineering Dept C Box 1315 Clinton MS 39060 SURVEILLANCE Electronics Plans Kits Assembled Catalog 3 00 S amp S Electronics P O Box 36505 123 San Jose CA 95158 SPEAKER enclosure design booklet Equa tions not found elsewhere crossover coilwrap ping information 3 00 Dennis Lance Ent P O Box 5986 Station L Edmonton AB Canada T6C 4G5 REMOTE CAR STARTER Plan Construc tion testing installat
59. 00 memory channels and direct keyboard or main dial tuning makes station selection The RZ 1 wide band scanning receiver covers 500 kHz 905 MHz in AM and narrow or wideband FM The automatic mode selection function makes listening super easy Other useful features include programmable scanning large built in speaker 110 volt AC or 12 volt DC operation with optional DCK 2 cable VHF capability 108 174 MHz with the VC 20 option dual 24 hour clocks with timer and even voice frequency readout with the VS 1 option easier One hundred memory channels with message and band marker direct keyboard or VFO frequency entry and versatile scanning functions such as memory channel and band scan with four types of scan stop The RZ 1is a 12 volt DC operated compact unit with built in speaker front mounted phones jack switchable AGC squelch for narrow FM illuminated keys and a beeper to confirm keyboard operation PG 2N Extra DC cable pecitications features and prices are subject to Change without notice or obligation ha arge fror lee D volt A 3 operation with the DCK 1C js and 118 174 MHz VHF capabi ity wit VC 10 option VC 10 VHF converter DCK 1DC cable kit for 12 volt DC use VC 20 VHF converter e VS 1 Voice module e DCK 2 for 12 volt DC operation YK 88A 1 AM filter e YK 88SN SSB filter e YK 88C CW filter e MB 430 Mounting bracket SP 430 External speaker e SP 41 Compact mobile sp
60. 1 2kw x 2th vC 6025 2 295 00 20MS s 5O0MHZ 2kw x 26h vC 6024 2 049 00 20MS s 20MH2 2kw x 2ch vC 5022 1 749 00 RSOs trom Ha ach feature SLEh functions as roll mode averaging save memory smoothing interpolation pretnggenng Curso measurements plotter interfaca and RS 232C interface With the conrort ol analog end the power of digdal w Hitachi Portable Scopes 435 DC to SOMHz 2 Chonnel DC offset DC to 20un function Aemate magnifier function Duai Channei V 529 CRT Readout Cursor Meas 1 025 V S23 Delayed Sweep 995 V 522 Basic Model 895 FREE DMM with putchase of ANY SCOPE SCOPE PROBES P 1 65MHz lx 10x 19 95 P 2 100MHz Ix 10x 23 95 V 422 40MKz Dua Trace 795 20MHz Elenco Oscilloscope 375 MO 1251 Dual Trace lt Component Tesier s 6 CRT K Operation TV Sync 2 p 1 Probes Elenco 35MHz Dual Trace Shown This series provides many new functions such as CRT Readout Cursor measurements V 1085 1065 665 Frequency Ctr 1085 Sweeptime Autoranging and Trigger Lock using a 6 incn CRT You dont teet tne compactness in terms of performance and operation V 660 60MHz Dual Trace 1 195 V 665 60MHz Dual Trace w Curso 1 345 V 1060 100MHz Dual Trace 1 425 V 1065 100MHz Dual Trace w Cursor 1 695 V 1085 100MHz Quad Trace wiCursor 2 045 V 1100A 100MHz Quad Trace w Cursor 2 295 V 1150 150MHz Quad Trace w Cursor 2 775 495 MO 1252 lt High luminance
61. 1 D or the Macintosh version DK201 D ME LEARN VOR CLEANING MAINTENANCE REPAIR EARN UP TO 1000 A WEEK WORKING PART TIME FROM YOUR OWN HOME THE MONEY MAKING OPPORTUNITY OF THE 1990 S IF you are able to work with common small hand tools and are familiar with basic electronics i e able to use voltmeter understand DC electronics IF you possess average mechanical ability and have a VCR on which to practice and learn then we can teach YOU VCR maintenance and repair FACT up to 90 of ALL VCR malfunctions are due to simple MECHANICAL or ELECTRO MECHANICAL breakdowns FACT over 77 million VCRs In use today nationwide Average VCR needs service or repair every 12 to 18 months Viejo s 400 PAGE TRAINING MANUAL over 500 photos and illustrations and AWARD WINNING VIDEO TRAINING TAPE reveals the SECRETS of VCR mainte nance and repair real world information that is NOT available elsewhere Aiso inciudes all the info you ll need regarding the BUSINESS SIDE of running asuccessful service opera tlon FREE INFORMATION CALL TOLL FREE 1 800 537 0589 Or write to Viejo Publications 5329 Fountain Ave Dept ME Los Angeles CA 90029 CIRCLE NO 32 ON FREE INFORMATION CARD You Are Here E BOOKS Inn Electronic References Every professional and serious amateur needs books to which he can refer to fill the gaps in his knowledge or to just recall to his mind particulars about h
62. 13 867 0081 HIGH TECH SPEAKERS DESIGN any size any power range speakers for a fraction of retail cost by PC computer 20 SACC P O Box 272825 Houston Texas 77277 CABLE TV EQUIPMENT CABLE TV converters and descramblers dis count center Jerrold Tocom Hamlin Scien tific Atlantic Oak Zenith Order yours today 800 962 6836 ELECTRONIC SURVEILLANCE ELECTRONIC SURVEILLANCE 40 complete construction plans from America s 1 designer of electronic spy equipment FREE CATALOG Wilson E P O Box 5264 Augusta GA 30906 CABLE TY CABLE TV Brokers and Distributors High volume of DESCRAMBLERS Jerrold SB 3 refurbished or as is CONVERTERS Jerrold Models DRX 400 JRX and Hand Remote Control no Canada sales for Descramblers AFFITECH ask Daniel Perreault 514 656 9150 CABLE EQUIPMENT CABLE TV SECRETS the outlaw publica tion the cable companies tried to ban HBO Movie Channel Showtime Descramblers Converters etc Suppliers list included 9 95 Cable Facts Box 711 ME Pataskala Ohio 43062 BUSINESS OPPORTUNITIES MAKE Become an American Electronics Dealer Profit opportunities since 1965 Call Jerry Norville 1 800 872 1373 Say You Saw It In Modern Electronics FOR SALE DESCRAMBLERS All brands Special Combo Jerrold 400 and B3 165 Complete cable descrambler kit 39 Complete satellite descrambler kit 45 Free Catalog MJO IN DUSTRY Box 531 Bronx NY 104
63. 4 FREE CATALOG Save hundreds on sought after electronic electro mechanical and com puter related hardware and components in cluding hard to find items Call toll free 1 800 776 3700 American Design Compo nents Dept 112 011 815 Fairview Avenue Fairview NJ 07022 SURVEILLANCE COUNTERSURVEIL LANCE equipment catalog transmitters de tection equipment phone caller identifica tion 10 00 EDE P O Box 337 Buffalo NY 14226 POWERFUL single chip FM room transmit ter size of a postage stamp transmits to any FM radio up to one mile away Complete kit 19 95 postpaid Hertz Microdevices P O Box 41771 Los Angeles California 90041 SURVEILLANCE Audio Video Infra red Laser Equipment Industrial or Private 500 Item Catalog 7 00 Security Systems 3017D Hudson New Orleans LA 70131 CONVERTERS ALL MAJOR BRANDS Info amp Orders 1 800 782 0552 Freeway Inc s m p P O 5036 Burnsville MN 55337 No MN sales CALLER ID displays phone number of person calling you after first ring stores phone num bers of 14 recent calls 89 95 ppd EDE P O Box 337 Buffalo NY 14226 716 691 3476 DIGITAL AUDIO SAMPLER Digitally re cord and playback any audio source with spe cial effects Microprocessor controlled elec tronic project For detailed plans send 10 00 to P O Box 341 Dearborn Hts MI 48127 ELECTRONIC Circuit Board Assembly rea sonable rates quality service proto types Alli ance El
64. 48 Fax 609 683 5882 CIRCLE NO 33 ON FREE INFORMATION CARD FEATURES g High Transfer Speed 80 40 msec g Long Exposure Times 1 2 minutes Long Cables to Computer greater than 50 ft g Low Light Levels gm Wide Spectral Range 400 1100nm B Digital Focussing B Antiblooming lll Stores images in TIFF and PCX Formats Bg C Mount Lens B Affordable 400 to 750 il Optional Advanced Image Processing 44 MODERN ELECTRONICS January 1991 definitely making turns with each successive click of the mouse until you end the run HiWire has a jerky but continu ous autopan When drawing a line or wire however autopan is disabled forcing you to center your work be fore you begin a long run so that the two ends connect But it s unlikely you ll run up against this problem often because at normal zoom the highest magnification possible HiWIRE has room to display an en tire B size worksheet on the screen Zooming out is the only option the end result being an E size drawing about the size of a postage stamp The advantage is that you can have more than one worksheet on the screen at the same time Hi WIRE al so has a windows function that lets you display two different areas of the screen alongside each other but for reference only because only the cur Use the free info card How do I get more data Free Product Information Readers can obtain free information on prod
65. 6 AQU3M Q10H S SS5T8 hi CI MF a Cae V BR et QU T f EEN iE aa ss JR EA ud o TR S YuN5IS um DD oz P T HHHHH 42 02 Ylva ONY 2 0 SS348QgQuv a XOT TSM age AN Ot C 4 B BDAC r SNG 180N5IS 31dI17 008 Y 1N3S38d38 SINIT UNDIS 383321H1 S133HS N3H1O0 NO 3HUN 3MHUS 3H1 3O S318U1 O1 Q3153NNOD 3HU S N 5IS 353H41 LYUHL 31UD2IQNI 3 18uv1 310N aXe QS 313 C 29 Les jn g z O2v zu T TQ ZOOPNT Fig 2 Schematic details of system CPU circuitry January 1991 MODERN ELECTRONICS 15 Say You Saw It In Modern Electronics J6 5Qa D2 v CC S LJ 1N4002 C35 Xa DATA RAM INPUT PORT c39 BNC IN J 4 Q F INPUTS 10 pf 3 10 PF j R11 De CADO TT RANGE SEL ERT GAI nq002 1 01V 0IV 2 1V DIV R13 07 3 1V DIV 220 1N4002 3 IRD R21 C34 500K E 1000 PF C36 D3 1 UF 1N4002 ze ZZ Fx 3 10 PF 4 PF SOK 0 70 PF pa P HA19216 LA TRIG RAM BD DATA RAM DISE RAM WR B TRIG AD CLOCK RAM WRN C37 Ja 1 Sk D4 1N4002 TE TX 74HC32 CCHAN A OR LA EXT TRIG ovcc DS 1N4002 vec AUTO e TRIGGER GAIN CLKZ40 j NORMA a R18 s CHAN B SINGLE STEP Z me lose arut Sank A DC 4 wA S ARM FREEZE READ BN TR E MODE C YIDADDLO 4 4 gt SINGLE SWEEP AUTO TRIS NOREAD TRTE EM CFREE IE anti li C
66. 61 0208 LASERS FREE hologram with catalog 1 00 Laser Illu sions 380 S State Road 434 Suite 1004 Dept 152 Altamonte Springs FL 32714 TELEVISION TRANSMITTERS TINY 2 WATT TELEVISION TRANSMIT TER 2 Mile Range Under 100 Complete Plans 12 95 Satisfaction Guaranteed SU PERCIRCUITS 1403 E Bayview Hermosa MISCELLANEOUS ASIAN LADIES want correspondence for friendship marriage SUNSHINE INTER NATIONAL Dept TW Box 5500 Kailua Kona Hawaii 96745 808 325 7707 GUARANTEED home business making 12 an hour part or full time Send 4 SASE Hobby Shop Box 1008 Grove Hill AL 36451 ASTONISHING rare technical devices in formation projects and plans Most unusual and comprehensive catalog of its kind 3 00 P A R RESEARCH 3404 Hillcrest Rd Harrisburg PA 17109 INVESTIGATION CAREER Quick home study Become a professional Free informa tion Since 1971 SIR P O BOX 716 PRO VO UTAH 84603 800 272 6680 CABLE TV DESCRAMBLERS BARGAIN HEADQUARTERS tu eJERROLD TOCOM HAMLIN OAK ZENITH eSCIENTIFIC ATLANTA 6 month warranty We ship C O D Lowest retail wholesale prices FREE CATALOG Global Cable Network 1032 Irving St Suite 109 S F CA 94122 Beach CA 90254 213 372 9166 NO CALIFORNIA SALES ES eS r ss ORDER TODAY 800 327 8544 CLASSIFIED ADVERTISING ORDER FORM Mail this form with payment to MODERN ELECTRONICS Classified
67. 8016 Function G sbotior with Freq Counter 249 Sine Square Triangle Pulse Ramp 2 to 2MH1 Freq Counter 1 10MdHa 47 ohm 1o 1M amp 100K pat 9620 Capactor Bior 47 ot to 10MF Digital Triple Power Supply XP 765 249 0 20V at 1 0 20V at 1A i SV a SA Fuly regulated Short circua prmecied with 2 limi control 3 seperate supplet XP 660 with Anaieg meters 175 WE WILL NOT BE UNDERSOLD UPS Shipping 48 States 52o 10 Max IL Res 7 Tax GF 8018 without Freq Meter 179 que 800 292 7711 708 541 0710 C amp S SALES INC 1245 Rosewood Deerfield IL 60015 129 RF Freq t00K 450MHz AM Modulation of 1KHz 3 dot LCD LEAKN TO BUILD AND PROGRAM COMPUTERS WITH THIS KIT INCLUOES AN Porte Aseembty and Lesson Monual Model MM 8000 129 00 Staring tom ecralch you bull a complete system Our Micro Mimi Wane aches you ID write vio RAMs ROMs and run a BOB mecroproces cor much ases exndar machvene ianguage as IGM PC You af wib Fw stared and store hese ROBOTICS KIT FOR ABOVE MM 8010 71 95 15 Day Money Back Guarantee 2 Year Warranty WRITE FOR FREE CATALOG CIRCLE NO 35 ON FREE INFORMATION CARD January 1991 MODERN ELECTRONICS 11 ina G78 siki z E gu i gn Part 1 The Modern Electronics Computer Experimenter Lab How to build a 200 Digital Storage Scope with an optional add on eight channel logic analyzer as the foundation for a complete
68. 95 plus 6 50 S amp H double sided silk screened pc board 39 95 plus 4 S amp H programmed ROM U10 29 95 plus 2 50 S amp H IC socket set 33 count 9 50 plus 1 S amp H 5 volt and 12 volt power supply kit 34 95 plus 4 S amp H Also 100 MHz scope probe with 10 1 at tenuator 27 50 plus 3 50 S amp H black steel cabinet 37 50 plus 4 50 S amp H eight channel logic analyzer all parts in cluding program 59 95 plus 3 S amp H MasterCard and Visa accepted Connecti cut residents please add state sales tax experiment to be presented will be supplied in a ROM or can be down loaded from any IBM PC or compa tible If you download you can also write your own programs using the DEBUG program in PC MS DOS or any assembler We will show you how easy this is to do When you reach the level in our se ries where you are writing your own programs you will be learning per 14 MODERN ELECTRONICS January 1991 haps the most widely used assembly language Sincethe digital signal gen erator incorporates the 8088 series microprocessor and support chips you will be able to learn both the hardware and software aspects of this series of processors and peri pherals Working with the scope and logic analyzer built from plans de tailed here will further help you to fully understand the all important timing functions as well as the logic functions How the DSO Works Here s a breakdown of how the Digi tal
69. A Packing function removes it Printer choice and control is ad mirable ranging from nine pin dot matrix to laser printers and all man ner of plotters HPGL for Hewlett Packard and IBM DM PL for Houston Instruments IBM color graphics printer and so on Software control permits you to choose plot layer choice of a plotter pen s thick ness Or multiple pens COM port andsoon An optional utility enables you to use a Gerber photo plotter and an MDA Fire 9000 laser photo plotter Being a very complete program there aren t many ProCAD short comings to be pointed out Among the minor ones is an autopan func tion that requires the cursor to be moved to the right or left side at the bottom of the work sheet because it bumps into an active bar in the mid dle the three other sides work nor mally Further autopan causes the screen to bump to the next location rather than scrolling smoothly In sum ProCAD contains an im pressively powerful and flexible sche matic capture program Combined with its integrated printed circuit board layout provisions and priced near the top of our group it s obvi ously a professional package that s not suitable for the casual user But for any serious drawing purposes where a microcomputer will suffice and board layout is also desirable it should be a leading candidate for purchase consideration CIRCLE NO 25 ON FREE INFORMATION CARD EE SS eee eee E
70. Ave 5 P O Box 677 Thief River Falls MN 56701 0677 Tel 1 800 344 4539 Cat N E2155 for 1 5 uF Cat No E2275 for 2 2 uF value C2 C3 220 uF 35 volt electrolytic ca pacitor Di thru D4 1N4001 or similar l am pere 400 PIV silicon rectifier diode or substitute full wave bridge recti fier assem bly see text D5 1 watt zener diode J N4733A 5 1 volts IN4742A 12 volts or other value as needed R1 100 ohm watt 10 tolerance resistor Misc Printed circuit board or per forated board see text suitable en closure ac line cord with plug hook up wire solder etc more current than the regulated out put of the circuit can safely provide can be connected to the unregulated C2 side of R1 Onthe test bench this circuit produced less than 1 millivolt of ripple current Though this supply may well be the answer for a cheap and easy way to power those small circuits that re quire ac line powering you should keep firmly in mind that the supply and whatever circuit it is powering are not completely isolated from the ac line Hence caution must be ob served when working with the supply The supply is suitable for powering a circuit from the ac line that is fully contained inside a protective enclo sure You can use a metal enclosure and a line cord with three conduc tors tying the ground conductor from the ac line to the metal of the enclosure The dc ground must al ways be isolated from
71. COLORED NEON STICK 74 50 LGU20 5TO 1MW VIS RED HeNe LASER GUN 199 50 BLS10 100 000 WATT BLASTER DEFENSE WAND 89 50 EASY ORDERING PROCEDURE TOLL FREE 1 800 221 1705 or 24 HRS ON 1 603 673 4730 or FAX IT TO 1 603 672 5406 VISA MC CHECK MO IN US FUNDS INCLUDE 10 SHIPPING ORDERS 100 00 amp UP ONLY ADD 10 00 CATALOG 1 00 OR FREE WITH ORDER INFORMATION UNLIMITED P O Box 716 DEPT ME9 AMHERST NH 03031 LEARN TO CLEAN MAINTAIN REPAIR FAX MACHINES R Work from your home van B Home study program gets you started servicing fax machines in 2 iral R Ne special tools equipment needed B Earn additional profits selling fax supplies e Fax machines are not cheap therefore you can get good for the repair e Average Fax machine requires professional service every 18 months Home stud dr param includes full instruc tions on EVERY ASPECT of Fax maintenance repair FULL COVERAGE of how to set up your home based service business FREE DETAILS CALL 1 800 537 0589 Or Write To Viejo Publications Inc 5329 Fountain Ave Dept ME FX Los Angeles CA 90029 CIRCLE NO 15 ON FREE INFORMATION CARD laser lens cleaning fluid to the inner most brush after which you placethe ZZ 2 Mf E TEERBS LD me P SEEN UNES c A ox Stereo Receiver Onkyo s Model TX 866 AM FM stereo receiver offers 88 watts per channel into 8 ohms 185 watts per channel into 2 ohms plus room
72. Dept 75 N Broadway G s aaa Hicksville NY 11801 Name CABLE TV BOXES Descramblers Converters treet Address maa aspa FREE CATALOG City Statt 1p TRANS WORLD CABLE CO 12062 Southwest 117th Ct Suite 126 Miami Florida 33186 Check category you wish to b listed under or note a special heading 6 additional you want 800 442 9333 Audio Communications Computers Electronics Video Miscellar eous Wanted Special Heading RE Y REMOTE CONTROL KEYCHAIN Complete we om ibd ES rece PRINTEACH WORDSEPARATELY Notethat P O Boxnumbers andtelephone numbers must r m w Fully assembled ctun plans DT build your own auto alarm Quantity discounts svailabte be counted as t wo words each Circle additional words you wish boldfaced at 20 more each initial a Check V aa or M C boldface word is free Minimum charge is for 15 words Add 3 shipping Au ONLY 24 95 VISITEC C BOX 442 SAN FRA Free Boldface 2 3 4 F 12 91 28 ax 41 5 872 2635 5 Kuu 7 8 9 10 T 12 13 4 15 15 Gi PICKS UP A WHISPER 50 FEET AWAY The model WAT 50 miniature FM tranmitter uses a e 4 stage circuit NOT to be confused with a simple pane less microphone Simply snap the unit on top of a I 17 18 18 19 19 20 20 Pene End OU an uel erat dh entire house up to 1 mile away Use with any FM radio Tunes to any frequency from 70mhz 130mhz Easy
73. E BE eae January 1991 MODERN ELECTRONICS 49 Say You Saw It In Modern Electronics a gS SSS iui Protel Schematic from Protel Technology Inc Protel Schematic is the easiest sche matic capture program to use in this review and quite versatile excepting sufficient support for other formats It s priced at a reasonable 495 and comes with a hefty component library The component library contains over 3 000 parts distributed among 14 library modules ten of which may be active There s a good balance be tween analog and digital parts and components can be called from the li brary by either entering generic names from the keyboard or by click ing on the part from a scrolling libra ry menu DeMorgan equivalents aren t supported however Device reference and multiple package designations are assigned at the time the part is placed on the worksheet and there s a warning message that prevents you from as signing the same reference to more than one device The program re members the last device placed on the worksheet permitting repeated com ponent placement without having to re enter the part name but you have to enter a reference name before the software places it into position De vices have only two reference lines neither of which can be moved How ever the size of the font is variable between 8 and 20 points and the schematic reference name can be hid den leaving just the part value
74. E Plus schematic capture section is fairly difficult to work with and lacks many of the features found in less expensive programs These shortcomings overshadow the inclu sion of PCB layout software in the package CIRCLE NO 23 ON FREE INFORMATION CARD tr OrCAD SDT III from Orcad Systems OrCAD SDT III was among the ear ly schematic capture packages to ap pear on the scene for microcomput ers It s still one of the most versatile and complete schematic capture pro grams around It s easy to learn and use comes with a huge component li brary is heavily supported by PCB and circuit simulator programs and the program carries a moderate 495 price tag OrCAD STD IIT s component li brary is made up of 1 library mod ules Included among the 3 500 plus components are several thousand logic chips 100 Intel and Motorola processors 40 PAL chips and a comprehensive assortment of r f and microwave devices It supports De Morgan symbols too A component can be called from the library by entering its generic name from the keyboard or by click ing on the part from a scrolling lib rary menu The selected component can be placed on the screen as many times as you wish by simply double clicking on the mouse Parts can be rotated and mirrored during or after placement Part reference annotation is done from an external utility not from the drawing program Device references MCM ELECTRONICS Answers to Che Law n
75. EE Designer HiWIRE and ProCA D also allow you to make printed circuit board layouts directly from the screen sche matic EE Designer further provides analog and digital circuit simulation to give designers an idea of how the circuit actually performs without re quiring hardware prototyping Prices of the programs range from 99 to 995 The ones that have PCB layout capability too are priced at the top end of course PCB software is more complex and therefore gener ally more costly than schematic cap ture software For example whereas Omation s schematic program is priced at 495 its Schema PCB soft ware starts at 975 for a total of 1 470 if you want both An integrated schematic PCB pro gram can be desirable because the user has a sort of seamless group of programs that utilize the same oper ating conventions Also the combin ation is generally less expensive than buying separate programs of equiva lent power Say You Saw It In Modern Electronics Computers Schematic capture programs alone on the other hand give you the flexi bility of choosing what you believe to be the most suitable printed circuit board program and vice versa An other consideration for choosing on ly schematic capture is that you may not wish to produce your own PCB layouts intending instead to farm out your netlists to third party PCB layout specialists You can expect the lower cost soft ware to have more shortcomings in
76. FIRST ST DAYTON OHIO 45402 ER TIRE KIT This popular kit contains po ore ee 170 of the PE ie mostpopular e W idler tires 10 Ji each of 17 different ND money by having the right save tire in stock Also included is a comprehen sive cross reference listing over 80 manu facturers assembly numbers and over 200 model numbers All tires are available individually for reorder A Matter of Values eIn the Power On Off IR Remote Con troller in the October issue there is an error in Fig 2 Theresistor and capacitor values do not cause the circuit to oscillate at 40 kHz as the article states The ap propriate equation for this circuit is f 1 44 R1 2R2 x C Try the values given in the article and you will see that one or more of them is incorrect Kevin C Carpenter Colchester VT The value of the capacitor should be 0 005 microfarad While this won t yield an exact 40 kHz the transmit frequency will be close enough for purposes of the project To get much closer to the mark Wi LETTERS ll sue I noticed a couple of minor errors In the first column on page 20 line 17 change inch to inch In the Bill of Materials change the fuse specifica tion to fast blow Adolph A Mangieri e Computer Controlled AC Interface November really caught my eye and is the type of material every computer hack er likes to experiment with This is a good project bu
77. HANNEL A EFL 0 5 zl l1 CHANNEL B m RI 717 A amp 1 BOTH AD WRN LOGIC ANALYZER DISPLAY MODE TRIGGER SLOPE A mC Fig 3 Input trigger A D converter and RAM circuitry details uw 2 la o m O UO z E z x un a gt gt x un 16 MODERN ELECTRONICS January 1991 information to be displayed This process continues until all 64 rows are filled Then we start again with row 1 Left on its own the polarized dis play cell can remain polarized for on ly about 100 ms after which it slowly returns to the background color To prevent this from occurring the cell must constantly be refreshed to maintain a high display contrast level This is done by the CPU 50to 60 times each second The only re maining display signal required is AC DRIVE which changes polarity every frame 64 rows This is required be cause chemicals used in the display will break down if the polarity used to polarize the cells is not reversed every frame much like charging a re chargeable battery If this signal is missing the display will not remain bright for very long In our DSO the first task performed is a check to see if the AC DRIVE signal is working Learning how LCD displays work Is important because the resolution of some of these systems is now ap proaching that of a CRT Full color VGA LCDs are showing up in the fancier portable computers and in dustry exp
78. MMED method of learning you ll quickly learn and then master the basics of electronics and electricity and then move on to DC AC circuit theories fundamentals of bi polar junction transistors BJT field effect transistors FET wiring diagram and sche matic readings component identification soldering techniques and much much more Your commitment to CIE ends with your payment but CIE s commitment to your success just begins when you receive your Free Issue of The Electron Build your personal burglar alarm e Instructors available 6 days a week 20 lesson books containing 39 theory and hands on training lessons and exams 5 Yes send me CIE s 39 Introductory Electronic and Electricity Lessons and Equipment Name Address City State Zip Age Phone TAT PA er BOOKSTORE CUR 1776 Fast 17th Street Cleveland Ohio 44114 Ba 216 781 9400 BK 04 All This and Much More For ONLY 39 lessons exams binders and equipment This special introductory price includes all the benefits and assistance CIE normally extends to its students and graduates You ll be e titled to unlimited access to CIE s faculty and staff to assist you in your studies via a toll free 800 number six days a week 24 hour turnaround on grading your submitted exams CIE Bookstore privileges a patented learning method refarence library a student faculty and alumni elect
79. NTS Whether you order part or all 25 613 MOUSER stocks and can ship todayii ELECTRONICS Stocking locations Across America CIRCLE NO 31 ON FREE INFORMATION CART January 1991 MODERN ELECTRONICS 69 More QSO s when you speak their language e Add extra spice to your DX QSO s e Let your DX friends know you care enough about them to learn their language After all they ve gone out of their way to learn English e Break the phone pile up with a few carefully chosen words in the DX station s own language You ll be amazed at the difference It s like adding 3 dB to your signal The Radio Amateur s Conversation Guide by OH1BR and OH3BAD gives you the 147 most often used phrases in eight languages English German French Italian Spanish Portuguese Cyrillic Russian Pho netic Russian Phonetic Japanese Phonetic alphabets and eight lan guage dictionary included in this rugged spiral bound manual a MUST for any serious DXer or Contestor Beat the competition Order yours to day Only 10 00 plus 2 00 per order shipping Supplements available inless used languages Dutch Flemish Danish Finnish Swedish Serbocratian 4 00 per supplement Be sure to state which language supplement you need New cassette tapes in eight languages Now you can hear the exact pronunciation of the sentences phrases and words covered in The Radio Amateur s Conversation Guide Each high quality language tape is re
80. Parts can be rotated and mirrored either during or after placement There s also a pin editor that lets you add delete or change the position of the pins associated with a compo nent The pin editor can be used as a quick way to make a one of a kind part without having to use the library editor but parts made this way have to beredrawn for each new schematic because they aren t transferable be tween files Wire placement is simply a matter of clicking the mouse button once to start the line and clicking it a second time to set the line in place and change its direction Protel Schematic also lets you draw 45 degree diagonals in the ortho mode Like OrCAD and ProCAD Pro tel Schematic has a macro recorder that records and saves your every keystroke or mouse click when acti vated There s no limit to the size of the macro or how many macros can be created Macros can even be nest ed in batch file fashion so that start ing a macro automatically runs a se quence of queued macros Autopan is supported but like a few others it jumps rather than scrolls The grid and grid snap can t be turned off but you have full con trol over screen display colors which means you can set the grid to the same color as the background and ef fectively hide it if it bothers you Editing features are excellent with single object move delete and jump plus block editing There s no undo but there is an undelete command that lets you undele
81. R24 sets dc offset voltage at the output of the op amp between 0 and 5 volts Bear in mind that the output voltage swing of the op amp must be restricted to the in put range of the A D converter Ac cordingly resistor R16 and diodes D6 and D7 limit the A D input swing to ground and volts AS you can see analog circuits are almost trivial elements within the whole circuit Furthermore the com ponents are expensive and require a great deal of support resistors and ca pacitors It will not be too long be fore an A D converter is available that can be directly connected to the inputs that will include programma ble level and sensitivity adjustments e Trigger Circuits The beginning of each horizontal trace is usually started or triggered by the input signal train You can select a specific voltage that the input signal must pass through DC mode or a voltage greater or less than the reference point set by the VERTICAL POSITION control AC mode Using SW1 you can also se lect the direction or slope of the sig nal For example if you select a trigger slope the trigger circuit will generate a trigger signal low to high at pin 7 of U26 only if the input U20 C24 c22 EIS 2 2UF d 1UF RG is going from low to high If you se lect a trigger slope the input pro duces a trigger signal only if theinput is going from high to low TRIGGER GAIN control R26 sets the trigger point In most cases you s
82. ROPTICS ssasmasd AND LASER Synthesis H 3329 29 95 Counts as 2 R 2981P 16 95 3276 22 95 M 3 D ELECTRONIC IC CIRCLETS 10018 39 95 WITH Counts as 2 2898 15 95 PRACTICAL APPLICATIONS 3260 522 95 ay min f For over 25 years your most complete kas n Aer E 1367P 24 95 Counts as 2 source for electronics books Camcorder x 293 THE CONELETE SG N OSCTLLOSCOPES 3279 36 95 Counts as 2 3307 26 95 3157P 16 95 1532P 14 95 Counts as 2 Mow to ert m F iitit gt j Etectronic Circuit ROBOT BUILDER S m Diagram 4 SONAMA i Las ROBOTICS PROJECTS L 1 Aut 3 303tP 17 95 2880P 14 95 Rex 3138 60 00 Counts as 3 Druge hakima amd rum HOME ELECTRICAL Hasic WIRING Cog Dwitai Wie p vaipilieed pra 1x a Electronics miam 4 FILTER DESIGN kan tamam c E 3360 29 95 3374 24 95 3072P 16 95 2800P 16 95 Counts most IOI FREE when you join the Xs 4 Eueeraumics Boon iue esas EL B04P 21 95 3370 25 95 3355 s26 95 Counts as 2 Counis as 2 15 Easy Electronic Projects y Mz 2925P 9 95 Counts as 2 SPHERE DNE HIE From Delton T Horn a ches T m7 Wr EE EO ATDONSS Projects you can build some unique Value S j R OP tOELLCTRONK 4A 3 I j La m some old favo
83. TE 21 16 PRINT COPYRIGHT GEORGE F STOCKMAN IV 1989 VCR SPRING ASSMT 120 DELAY TIMER 5 WHILE DELAY gt TIMER WEND 130 LOCATE 21 16 PRINT STRING 41 32 Aida 140 LOCATE 21 11 PRINT BIT NUMBER TO TOGGLE CR TO RESET eee ESC TO END assortment net 150 AS INKEY IF A THEN 150 S al 160 IF A 0 THEN 240 ELSE IF A 1 THEN 260 ELSE IF A of springs 2 ries 280 i usedi 170 IP AS 3 THEN 300 ELSE IF A 4 THEN 320 ELSE IF A many n Sit THEN 340 180 IP A 6 THEN 360 ELSE IF A 7 THEN 380 brand V 190 IP AS lt gt CHR 13 THEN 230 Clutch sings idler springs tension p PT s 9 MA URS M a Sm 9 BITS springs etc 11 tension springs and 5 220 BIT4 0 BITS 0 BIT6 0 BIT 0 GOTO 430 pressure springs 230 IF A CHRS 27 THEN CLS SYSTEM ELSE BEEP GOTO 150 50 240 IF BITO 0 THEN BITO 1 DEC DEC 1 ELSE BITO 0 DEC MM 430 300 1 DEC 1 250 GOTO 390 VCR WASHER ASSMT 260 IP BIT1 0 THEN BIT1 1 DEC DEC 2 ELSE BIT1 0 DEC DEC 2 I _ G 270 GOTO 390 A wide e O 280 IP BIT2 0 THEN BIT2 1 DEC DEC 4 ELSE BIT2 0 DEC assortment e e UD of plastic LE W 300 IF BIT3 0 THEN BIT3 1 DEC DEC 8 ELSE BIT3 0 DEC washe T a DEC 8 used in m ross 310 GOTO 390 320 IF BIT4 O THEN BIT4 1 DEC DEC 16 ELSE BIT4 0 DEC clutch ass mblies and idlers 150 pieces DEC 16 itri 330 GOTO 390
84. al timebase that measures the pulse length to determine if it is a 1 or a 0 In a similar manner it sends 1s and Os back using long and short pulses Because it uses the same conductor to send and receive infor mation the device can be read with just one signal conductor The chip operates on a minute amount of power it is powered from the signal coming in A reservoir of charge made from internal capacitance stores energy when the incoming signal is high When the input signal is low the stored charge provides power The internal charge source is refreshed every time there is a signal transition The Silicon Serial Number chip con tains 64 bits that are written by a laser at the Dallas manufacturing facility The first eight bits contain the model number The next 48 bits are the one of a kind se rial number The last eight bits contain CRC cyclic redundancy check circuitry that in addition to ensuring that each chip is unique verifies that the bits are free of corruption and that there is no er ror in thetransmission link to the system Should the CRC circuitry not validate the serial number the system indicates that the number is not to be trusted In addition to serving the function of a license plate the DS2400 can serve as a network address Because it is unique the chip can provide the node number for a local area network LAN which is es sential to distinguish one node among many A third use is as an access
85. allenge serious club players and has integrated coaching features for beginners It plays both rubber and duplicate bridge You can select up to five major bidding de scriptions Acol American 5 Card major French 5 Card major Ameri can Standard and Precision club with 11 bidding conventions If play ers choose to play against different conventions they can set the Portable Computer The new 6 pound with battery Tan dy 1500 HD notebook PC comes with both standard floppy and hard disk drives Built around the NEC V20 microprocessor operating at 10 MHz and 0 wait state the computer features 640K of user RAM expand able to 1 64 M 3 5 inch 1 44MB floppy drive 20MB hard drive with 23 ms access time high definition blue on white LCD screen with 640 x 200 pixel resolution MS DOS 3 3 DeskMate personal producti vity software and LIM 4 0 expanded memory driver A rechargeable Ni Cd battery is said to provide more than 3 5 hours of computing time A new Power View LED system monitors battery status This indicator and the Power indicator are located on the top right of the computer case for clear visibil ity without lifting the display The Power switch is also located under the display to prevent accidental bat tery drain The battery weighs just 12 ounces and recharges in only 4 hours with TEA North South and East West posi tions separately Built in coaching features help de
86. an be made by setting the IN Fun and Easy SEL switch to DC and measuring the PART 1 DC 53 min dc voltage at the output of U20 Set Electronics and You VT 201 the CAL control so that the baseline PART 2 AC 71 min eens Wi um CHA moves five divisions when connect Wara ka ae elena PART 6 OSCILLATORS ing the input of the scope project to PART 3 SEMICONDUCTORS Electronics and You V T 208 the output at U20 Next month the series will show you how to build a function genera Electronics and You VT 205 VCR MAINTENANCE amp REPAIR PART 4 POWER SUPPLY VT 203 54 min 32 95 INTRODUCTION TO VCR REPAIR tor and lay the ground for putting to VT 204 110 Min 59 95 gether a digital signal generator CALL TOLL FREE AT Upon completing the instrument vISA foundation a host of application ex 1 800 678 61 13 periments will follow in later issues afl ened on ca dr toi that utilize these test research de m giu us STOR u velopment instruments ME P O BOX 928 GREENVILLE OH 45331 e u CIRCLE NO 21 ON FREE INFORMATION CARD Say You Saw It In Modern Electronics January 1991 MODERN ELECTRONICS 29 COMMUNICATIONS AOR Scanners Great Performance Great Service Great Value Free Freight 25 Day Money Back Guarantee Toll Free Service and Support No Credit Card SECUTI i One Year Warranty AR1000 499 1000 Channels 8 600MHz 805 1300MHz Stan
87. atic details of a phase locked loop 2 to 9 kHz frequency synthesizer Qv 7 t n Ri 10K R2 R3 100K Rq SK ous circuit the budget of most electronics experi menters Today however you can buy modular crystal oscillators for less than 4 Figure 6is a drawing of atypical mod ular oscillator in a package about the size ofa 14 pin DIP Crystal oscillators usually drive an other circuit but they can also drive LEDs and laser diodes Figure 7 for ex ample shows how an oscillator module with a TTL output can drivean LED The result is a light beam transmitter modu lated at a highly stable frequency If you re very careful you can possibly transform a cheap digital watch into a l Hz timebase Another method is to divide the output from a 60 Hz oscillator as shown in Fig 8 The fundamental signal is supplied by an inexpensive around 3 or so plus shipping 60 Hz modular oscillator from Marlin P Jones amp Associates No 3398 CY request catalog from address given above for latest price A pair of 4017 counters divides the 60 Hz signal first by 6 and then by 10 to arrive at Hz The circuit in Fig 8 shows the output connected to an LED I did thisto makea precision Hz flasher If you prefer you can drop the LED and drive other circuits directly from the output o the circuit Alternatively you can substitute a piezo electric tone source for the LED to create a tone that sounds at precise l seco
88. ation Mouser Electronics NRI Schools Pacific Cable Co Inc Parts Express International Sams Books Video Tech Viejo Publications Visitect Inc We d like to see your company listed here too Contact Jonathan Kummer at 516 681 2922 to work out an advertising program tailored to suit your needs Free Product Information Readers can obtain free information on products advertised by the above compa nies as well as for some editorially men tioned products Simply circle the appro priate number printed below an adver tisement onto the Modern Electronics Free Information Service card bound into this issue After filling in your name and address just mail the postpaid card Your request will be forwarded directly to the advertiser with a mailing label pre pared by our reader service department to ensure speedy response Say You Saw It In Modern Electronics Discover Your Career Potential In The Fast Growing Field Of High Tech Electronics CIE Gives You The Training You Need to Succeed f you re anxious to get al ead and build a real career you owe it to yourself to find out about the Cleveland Institute of Electronics CIE can help you discover your career potential in the fast growing field of high tech electronics A career that will challenge and exci e you every day reward you with a powerful feeling of personel accomplishment and deliver a level of financial security you may have only drea
89. atory equipment is included in your tuition cost There is no extra charge it s yours to use while you study at home and on the job after you complete your course Earn Your Degree To Become A Professional In Electronics Every CIE course you take eams you credit towards the completion of your Associate in Applied Science Degree so you can work towards your degree in the career of your dreams And CIE also features stages And CIE is the only school that awards you military and union re training to build on what Personal Training From A for fast study which can save you thousands of you already know Renowned Faculty dollars in obtaining the same electronics education Dozens Of Fascinating Unlike the impersonal approach of large class found in four year Bachelors Degree programs Careers To Chouse From room study CIE offers you one on one instructional Write for details today Ever aon merit gure Wid aneri tem help 6 days a week toll free Each CIE lesson is sss ma r authored by an independent specialist backed by the cain es you pre with T lessons CIE instructors who work directly with you to Send For Your applicable to alt areas of electronics As you answer your questions and provide technical assis advance CIE makes job opportunities available PIA tance ess you need it Catalog Today to you through the bimonthly school paper ro Soy The Electron J T CIE World Headquarters
90. b dynamic range The pacesetting IC R7000 receives today S hot areas of interest including aircraft marine public services amateur and satellite transmissions in the 22MHz ue RESET Ch AUTO M gm to 2000MHz range It includes all mode operation low noise circuits plus out standing sensitivity and selectivity The IC R71A R7000 combination is your window to the world The IC R71A is a short wave listener s delight Its 32 tunable memories store frequency and mode information and they are single button reprogrammable independent of VFO A or VFO B s operations Dual width an adjustable noise blanker panel selectable RF preamp and selectable AGC combined with four scan modes and all mode squelch further enhance the IC R71A s HF reception The IC R7000 features 99 tunable memories and six scanning modes It even scans a band and loads memories 80 to 99 with active frequencies without a Li E v a i ECT THE WORLD ICOM RECEIVERS operator assistance Additional features include selectable scan speed pause delays wide narrow FM reception and high frequency stability Options C R7000 RC 12 remote control EX 310 voice synthesizer CK 70 DC adapter MB 12 mobile bracket IC R71A RC 11 remote control EX 310 voice synthesizer CK 70 DC adapter MB 12 mobile bracket FL 32A 500Hz FL 63A 250Hz and FL 44A filters See these quality ICOM receivers at your local authorized ICOM
91. baud internal modem 200 spare battery 100 and choice of carrying cases 1 999 CIRCLE NO 6 ON FREE INFORMATION CARD 8 MODERN ELECTRONICS January 1991 Say You Saw It In Modern Electronics pere and two variable 1 3 to 20 volts at 250 mA each It features series and parallel operation and digital current and voltage metering via a three digit inch tall LED numeric display Display accuracy is rated at 0 5 1 digit All supplies are current limited and short circuit protected CIRCLE NO 3 ON FREE INFORMATION CARD Video Rebroadcaster Midland International s Model 72 400 Pow R Max Video Commander rebroadcasts programs from VCRs or any other source that has an audio video jack to one or more TV receiver locations up to 100 feet away The system is made up of a small trans mitter and one or more receivers A c T d eat w ats uote t XP j LP viDEO C IDES c FO COM gt ER separate receiver is required by each TV receiver that is to pick up the re broadcast signal To install the sys tem you simply plug the transmitter into the desired video program source and a receiver into each TV re ceiver that is to pick up the signal The 72 400 uses a different broad casting system than previous sys tems t eliminates the need for fine tuning systems and has special filter ing to prevent interference in metro Say You Saw It In Modern Electronics politan areas The new tran
92. c Analyzer Circuits The optional eight channel logic an alyzer s inputs are shown in Fig 4 The program produces the LOGIC AN ALYZER WR signal that connects in puts buffered by U 9 to the data RAM data inputs when incoming da ta is being written to the RAM The LA TRIG signal from input data line DO is coupled to TRIGGER SEL switch S4 through buffer U27A These in puts are pulled high So when an in put is not being used the display will indicate a high level for that input The input cable assembly consists of a 14 conductor ribbon cable with nine hook connectors This provides a ground wire between each connec tion which reduces coupling be tween inputs The A D Converter The A D converter see U25 in Fig 3 is a high speed flash type unit that produces a six bit digital output To perform a conversion the input cir cuit uses 64 comparators It works as follows If the input voltage compared to bot tom reference VRBat pin 10 of U25 is zero the binary digital output will be 000000 If the input is the same as top reference VRT at pin 9 the binary dig ital output will be 111111 Should the input exceed the top reference the OVERFLOw signal at pin 2 will be a 1 On the rising edge of the clock com parator outputs are clocked into in ternal decoders On the falling edge of the clock digital output is clocked to the output pins See Fig 9 Now we get into a slightly tricky area Note that output si
93. can fix it Only NRI the leader in career building electronics training for more than 75 years gives you such practical real world computer servicing experience Indeed no other training in school on the job anywbere shows you how to troubleshoot and service computers like NRI You get in demand computer skills as you train with your own AT compatible computer system now with 20 meg hard drive and 1 meg RAM With NRI s exclusive hands on training you actually build and keep the powerful new AT compatible West Coast 1010 ES computer complete with 1 meg RAM and 20 meg hard disk drive You start by assembling and testing the intelligent keyboard move on to test the circuitry on the main logic board install the power supply and 5 14 floppy disk drive Now includes AT compatible computer with 1 meg RAMand20meg A hard drive then interface your high resolution monitor But that s not all Only NRI gives you a top rated micro with complete training built into the assembly process Your NRI hands on training continues as you install the powerful 20 megabyte hard disk drive today s most wanted computer peripheral included in your course to dramatically increase your computer s data storage capacity while giving you lightning quick data access Having fully assembled your West Coast 1010 ES you take it through a complete series of diag nostic tests mastering professional comput
94. ch faster than if you had to access it from the CD ROM You can also for a 15 handling charge get paper versions of the documentation for the four applications I ordered these just to have them on hand and they ar rived in a fairly hefty box that I ve yet to open I admit to preferring the Hyper Card approach which lets me browse from one point of interest to another Microsoft suggests that you use the Of fice with a Mac Plus or more powerful system with at least 2MB of RAM I ran the Office from both a Mac IIx with 8MB and my old Mac 512e which was bumped up to IMB with Dove s Mac Snap and I have to concur with the rec ommendations It s possible to run the Office on a IMB Mac but every now and then I got a system error that blew me off of the machine This never occurred with the Mac IIx And the system does run much faster on the IIx a consideration to keep in mind when using a slow CD ROM Is the Microsoft Office a good buy It all depends on whether or not you have a use for the applications it contains If you need only one or two of the applications it s less expensive to purchase them on conventional floppy disks That way you re not paying for something you ll never use or which will be upgraded sub stantially before you ever look at it But if you need at least three of the four applications the CD ROM is a good val ue And the CD ROM versions come with the terrific on line HyperCard help system and
95. cilloscopes From HITACHI A Compact Serles Scopes lt The RSO its the new solution View Acquire Test Tronsfer ond Document Your Wavetorm Dato i 4 Chonnel 100MS 5 Model Introductory Price 100MS s 25MS s on 4 charneis simuitaneousiy 100MH2 4kw 1 Ich 2kw x 2c Ikw a ch VC 6145 4 695 00 Compoct Full Feat rce Models Delayed Sweep Lightweight 13405 2mV Sens 3 Yr Warranty Mode 1068 aasan IS off or power fails the Bridge performs many of its functions If morechannels are needed to per form household functions a Digital expander can be added Up to eight bridges and 16 expanders can be con nected to a single computer without using up any slots or SCSI ports The easy to install system attaches to a Macintosh via standard key board cables included in the package It can easily be adapted to monitor and control custom applications us ing the software provided Modules for writing your own software are also included and telephone support is available About 500 CIRCLE NO 14 ON FREE INFORMATION CARD Universal Counter Tektronix s new Model CDC250 uni versal counter is designed for use ap plications where multiple measure ment capabilities are needed The dual channel instrument counts sig nal frequency of sine square and tri angle waveforms over a range from 5 Say You Saw It In Modern Electronics 40MS s 100MH2 4kw x Ch 2kw x 2ch vC 5045 3 049 00 20MS s 50MH
96. cludes the electronics and more powerful laser necessarv to burn data into the disk At the present time most of you will have little use for this type of device As a rule WORM systems are incom patible with CD ROMs although some vendors have produced prototypes of systems that can also act as a ROM reader and are considerably more expen sive to boot At between 1 500 and 4 000 they re most often used to store large amounts of information on line Some examples of where WORM drives can be useful include archiving large amounts of vital data such as accounting information and as a backup medium for very large hard disks There s even another step past WORM drives in optical storage for those who can foot the bill and need the capability re writeable optical disks Unlike a WORM drive which produces an irre versible change to the media when writing data a re writeable optical disk uses the combination of the heat produced by the laser beam and a strong magnetic field to alter the media When subjected to the same combination a second time in the exact same location on disk the media returns to its previous state thus effec tively being erased Re writeable optical disks are available right now but their high cost 4 000 and up has kept them from being adopted at the personal level Eventually when prices come down they ll start to become very practical for the storage of programs and data that you want on l
97. code As an example application a garage door opener requires a unique code word so that one opener does not open every ga rage door Currently this requires either a set of DIP switches or unique software in each opener The Silicon Serial Num ber can accomplish this at low cost see Fig 1 Because each chip is different all DOOR RECEIVER 4 Bit LIC COP 426C RF RECEIVER EconoRAM INO DOOR OPENER TRANSMITTER SILICON SERIAL NUMBER COP 426C D2 4 10 40 METERS Sy E 5V ig G2 LO gt DOOR Fig 1 Details of a remote door entry monitoring system built around the Dallas Semiconductor Silicon Serial Number chip 72 MODERN ELECTRONICS January 1991 Say You Saw It In Modern Electronics other components in the equipment can be the same lowering the manufacturing cost Answering machines with a remote message retrieval feature are another ex ample of an application for this chip As a further service Dallas Semicon ductor provides a directory with listed and unlisted numbers much like a tele phone directory Listed numbers can be referenced to their owners On request the company will update the directory to show change of ownership of the chip It is also putting into place measures to pro tect the identity of unlisted customers Packaged in a T0 92 plastic transistor case the DS2400 silicon Serial Number chip sells for 35 cents in quantities of 100 000
98. corded with proper dialect and usage in one of the languages in the Conversation Guide e lt i 00000 ee Ey BOOKSTORE GREENVILLE NH 03048 Now a division of CQ Communications Inc Please send the following Conversation Guide Book 10 Language Tapes 10 each Supplements 4 each German C Portuguese JDutch Flemish JFrench O Russian O Danish Spanish Japanese O Finnish O Finnish Swedish O Serbocroation OSwedish Add 2 for postage and handling in North America Total Name Address City O Check Card No State N O MasterCard O VISA JAmex Expires O Money Order 70 MODERN ELECTRONICS January 1991 PC CAPERS cece ples that accompany certain selections At 149 though the electronic version is considerably more expensive than the Original Butif you have botha Macanda CD ROM player The Electronic Whole Earth Catalog is one CD ROM you must add to your collection CD 7 and Macademic The two CD ROMs discussed above were both fairly expensive propositions As with software in general not every CD ROM package costs an arm and a leg The CD 7 and Macademic ROMs from QL Tech are good examples of ROM based values Both CD ROMs are collections of public domain software and shareware for the Mac The difference between public domain software and shareware if you re unfamiliar with the term is that you re free to use software that has been put int
99. cross reference and partial number searches are all supported on the disk These features permit users to display information on thousands of Motorola devices to locate direct and si milar replacements for more than 25 000 competitive devices and to view entire families of products with the partial num ber search The data disk offers an easy to use fast alternative to the printed selection guide All searches are performed in less than a second and no user manual is re quired Users simply insert the disk type M and begin Smart messages and prompts guide even first time users through the program smoothly The data disk provides a list of Motor ola technical literature for every device in the database This literature includes ap plication notes engineering bulletins ar ticle reprints training courses data books and data sheets complete with document numbers and titles The soft ware will even print an information re quest form to make it convenient to order any literature item The IBM version of the Motorola Elec tronic Selection Guide comes on two 360K 5 inch floppies one for discrete devices and one for ICs The Macintosh version comes on a single 800K 3 inch microfloppy To receive a free Motorola Electronic Selection Guide write to Motorola Data Disk Literature Distribution Center P O Box 20924 Phoenix AZ 85063 or call 1 800 521 6274 Specify if you re quire the IBM compatible version DK10
100. crystal oscillator cir cuits can be made by wiring together few er than half a dozen discrete components Shown in Fig 2 is one of the simplest a unijunction oscillator in which the usual timing capacitor is replaced by a quartz crystal When the crystal has a resonant frequency of MHz the oscillator can be caused to oscillate over a range of from around 50 kHz to exactly 1 MHz simply by adjusting R7 Optimum operation oc curs at MHz The output signal from this circuit is a series of fast rising spikes whose fall time is slower than their rise time If you con nect an oscilloscope to the output of the circuit you ll notice that the oscillator s frequency increases in incremental jumps as the resistance of R7 is reduced This is because the crystal prefers to oscillate at various harmonics of its MHz funda mental frequency As you approach the MHz region the oscillator will quickly lock onto the 1 MHz fundamental The Fig 3 circuit is useful for under standing operation of quartz crystals and checking their condition It can also sup ply a marker frequency for calibrating a communications receiver since the circuit will function as a very low powered r f transmitter For higher frequencies se lect a crystal with a higher frequency If the circuit works at only low frequencies try changing the UJT until you find one that works well at the desired frequency If you have an oscilloscope watch the shape of the wave
101. ct U2 to the data bus If the scope is displaying Channel B the 8155 produces a high level at pin 1 of U22A Pin 2 receives the CS FX sig nal The resultant READ BN signal is sent to the Channel B bus see Fig 5 Channel B is not shown at this time but consists of the same components and signals that are in Fig 3 except for the trigger and some of the I O logic already used for Channel A that is common for both channels The bus permits the Channel B board to be plugged into the main board In puts and controls are located just be hind Channel A controls e Analog Inputs Now look at the an alog input circuit area in Fig 3 The inputs from either J or J7 are cou pled to the input of the first AD843 operational amplifier through SW2 This switch configures operation of the input circuit for either ac or dc coupling A center position on this switch grounds the input to provide a convenient 0 reference point INPUT ATTENUATOR SW3 permits selec tion of a divide by 2 20 or 200 Ca pacitors C42 C43 and C44 are small trimmers that you adjust to provide a s rs EE 18 MODERN ELECTRONICS January 1991 Say You Saw It In Modern Electronics Now for the first time in CIE s 56 year history you do not have to be enrolled at CIE to receive our introduc tory Electronic and Electricity Lesson Modules Available for a limited time to non students for the shockingly low price of only 99 50 With CIE s patented AUTO PROGRA
102. ctly on panel of project s enclosure smaller ones with aid of two terminal strips and conductor to assure a tight fit At the other end of the bell wire temporarily connect the two conduc tors to the unused leads of the transformer Calibration amp Use Before you can calibrate the circuit you must check the phasing of the pickup coils to make sure that their effects are additive Connect a resis tance substitution box or 50 000 ohm potentiometer across the con nection points for R7 in the main cir cuit and set S7 to the 0 5 KW position Turn on a number of loads in your home including at least one 220 volt appliance to assure that both high sides of the ac line are carrying cur rent Adjust the resistance box or po tentiometer for a mid scale reading on the meter Note the reading obtained Then test the phasing of the pickups by re versing the leads of only one of the pickups This may be easier to do if you have a helper to tell you what happens at the meter panel as you re verse connections Connect the pick ups for highest meter reading Solder the connections and insulate them with either small diameter heat shrinkable tubing or electrical tape Now use a number of loads whose power consumption is known such as lamps with acertain wattage rating lt gaxThree conduetive service conductive service from utility company Kilowatt hour mST rr zi BI da fe or F ap visa Tz
103. d printing sup port Both can be expanded though with the company s optional utilities Individually their cost totals 167 but all can be bought at the outset with SuperCAD for 100 more Su perCAD Plus 199 Say You Saw It In Modern Electronics The component library comes with over 350 devices for immediate use 233 of which are TTL logic chips They re distributed among 11 library modules that are always active A Li brary Parts Build program how ever can greatly extend this number There s a good variety of device types including DSP digital signal processing PLD and microproces sor chips plus DeMorgan equiva lents More serious users would add LIB 2 the additional parts library 49 of course Components are called up via a window that lets you select the libra ry module of your choice using a mouse Once inside the library you simply click on the part you want Up to six devices can be moved from the window to an on screen quick access drawing cell that lets you place a part without having to go through the window routine again making multi ple placements a breeze Parts can be rotated but the rota tion point is outside the device out line forcing you to move the part after rotation Each worksheet also has four drawing planes that can be displayed individually or superim posed More costly CAD programs often use layers to separate colors Components are placed on the workshe
104. d with the Office package is a presentation graphics sys tem You can use it to prepare slides overheads and other supporting materi als for presentations and reports This is done by assembling a set of slides each of which can contain both graphics and text PowerPoint does let you per form some freehand drawing but it is INTRODUCTION amp FIRST TIME HELP WHOLE i SYSTEMS W COMMUNITY PLACE HOUSEHOLD CRAFT LIVELIHOOD ick NAME lO filer cle EL TIE E EB SEARCH ae l ria qua Ha it m Pt ae AG eu 3l bali HEALTH NOMADICS MEDIA LEARN ING MUSIC INDEX IT E LR ERIT Vac dite cereals As with the documentation for The Microsoft Office the information on the included third party resources is contained in a hyperCard stack really set up to use graphics imported from other applications either clip art or those created by a paint or draw program such as Aldus FreeHand Creating text slides or adding text over a graphic is really easy Several typefaces are included as are templates standard formats for presentations including lists bulleted lists numbered lists and various forms of outlines Just pick the one s you wish to use and add your owntext by typing it in directly or by importing it in as a word processor or outliner file I ve used both the Mac and Windows versions of PowerPoint to cceate about a dozen presentations and I ve found
105. dard Features Extremely compact size Continuous coverage except UHF TV 600 805 Antenna attenuator switch 10db Manual tuning knob Earphone jack 3 5mm AM FM and wide band FM tuning modes Backlighted LCD display 10 Scan Banks 10 Search Banks Selectable Priority Channel Delay Hold Features Selectable Search Increments 5 955K Hz Permanent memory backup 4 AA Ni Cad batteries included AC adaptor charger Carry Case Cigarette Lighter Charger Belt Clip Earphone Options External Speaker Mobile Mount MS190 19 50 Extended Warranty 2 3 yrs 45 55 Specifications Coverage 8 600 805 1300MHz Sensitivity 35uV NFM 1 0uV WFM 1 0AM Speed 20 ch sec scan 40 ch sec search 561 225 58 075 455KHz or 10 7MHz Increments 5 to 955KHz selectable 5 or 12 5 steps Audio 4 Watts Power Input 9 13 8 V DC Antenna BNC Display LCD Dimensions 67 8Hx13 4Dx2 1 2W 120z wt AR950 239 100 Channels Low Air High UHF amp 800MHz Standard Features Extremely compact size Unrestricted 800MHz coverage 100 channels permanent memory Earphone Jack amp Attenuator Delay Hold features Channel 1 Priority 5 Scan Banks 5 Search Banks Telescopic and Flexible Antennas w BNC connector AC amp DC Power cords w mtng hardware One Year Limited Warranty Options Base type antenna 25 to 1000MHz w 50 coax AS300 59 95 Mag Mnt
106. dds the capability of monitoring large areas for fire intrusion and air quality The robot navigates primarily through use of a digital sonar system that s programmed by drawing routes onto a CAD drawing of the facility A Dispatcher program uses this data to generate random patrol programs that are transmitted to the robot via radio The operator can also drive the robot remotely to investigate special situations The robot s base contains sensors for temperature smoke gas and relative humidity as well as an interface for an option Camera system A rotating head has a passive infrared scanning imager a K Band presence radar and a UV detectors The radar can detect objects through walls APPLIANCE REMOTE CONTROLLERS NEC Electronics Mountain View CA introduced three low voltage low current controllers fcr remote control applications in household appliances and air conditioners All feature a carrier generator circuit for infrared remote control They operate on a voltage range of 2V to 6V enabling operation with two batteries Say You Saw It In Modern Electronics January 1991 MODERN ELECTRONICS 7 Wi NEW PRODUCTS a For more information on products described please circle the appropri ate number on the Free Information Card bound into this issue or write to the manufacturer Computerized Bridge Game Pro Bridge 500 from Saitek Indus tries Ltd Torrance CA is a new computerized bridge game that is claimed to ch
107. dealer today Specifications of the ICR W00 guaranteed from 25 1000M H and 1260 1 4300M Hz No coverage from 1000 1025MH ICOM America Inc 2380 116th Ave N E Bellevue WA 98004 Customer Service Hotline 206 454 7619 3150 Premier Drive Suite 126 Irving TX 75063 1777 Phoenix Parkway Suite 201 Atlanta GA 30349 ICOM CANADA A Division of ICOM America Inc 3071 5 Road Unit 9 Richmond B C V6X 2T4 canes Ali stated specihcaron ibrect lO change without rx OM radios significantly exceed FCC regulations limaing Sporniou ou il uil ICOM First in Communications EDITORIAL STAFF Art Salsberg Editor in Chief Alexander W Burawa Managing Editor Dorothy Kehrwieder Production Manager Emily Kreutz Production Elizabeth Ryan Art Director Barbara Terzo Artist Pat Le Blanc Florence V Martin Linda Romanello Phototypographers Hal Keith Illustrator Bruce Morgan Photographer Joe Desposito Forrest Mims II Ted Needleman Curt Phillips Contributing Editors BUSINESS STAFF Richard A Ross Publisher Art Salsberg Associate Publisher Dorothy Kehrwieder General Manager Frank V Fuzia Controller Catherine Ross Circulation Director Melissa Kehrwieder Data Processing Carol Minervini Data Processing Karen Nauth Customer Service ADVERTISING SALES ELECTRONIC ADVERTISING Jonathan Kummer 516 681 2922 FAX 516 681 2926 COMPUTER ADVERTISING Ken L Wood 407 264 0545
108. ded cleaning and lubrication procedures and mechanical section repair J A Sam Wilson s Electronic Trou bleshooting Procedures and Servicing Techniques Prentice Hall hard cover 254 pages 38 60 offers practical guid ance for general electronics trouble shooting and repair from single compo nents through circuits and on up through full blown systems It is a compendium of troubleshooting tests measurements and servicing techniques Unlike other books of this nature though this one is organized by techniques rather than a formal troubleshooting procedure This departure is not a negative rather itisan alternative that can proveto be eminently suitable for a wide variety of problem sit uations To provide a hands on ap proach the book uses an unintimidating simple radio receiver as an example for discussing the system concept Symp toms are used whenever possible to illus trate how to zero in on the section at fault in a system eae ee ee REUS TET EMEN NEW LITERATURE Learn At Home Catalog The Fall 1990 HomeWorks by Heathkit Catalog from the Heath Co St Joseph MI details the company s full line of learn at home electronics courses The colorful 32 page Catalog describes courses in basic and ad vanced electronics laser technology dig Continued on page 82 Put Professional Knowledge and a COLLEGE DEGREE Add prestige and earning power to your technical career by ea
109. driving an external transistor dynamic speaker combination in a single ended configuration and then the chip starts to play Play is terminated by removing the supply volt age or on completion of the entire play Tunes currently available are old fav orites such as Happy Birthday and As Time Goes By Christmas favor ites such as Jingle Bells and Walk ing in a Winter Wonderland and other tunes The circuits are available from LSI s exclusive distributor Thumb Elec tronics P O Box 263 Avoca MI 48006 Thumb charges 1 50 per IC A six tune assortment is 10 Silicon Pressure Sensor Motorola 5005 E McDowel Rd Phoe nix AZ 85008 has introduced an inte grated pressure sensor The MPX5100D is a 0 to 15 psi fully signal conditioned output pressure sensor that integrates the sensing element offset calibration temperature compensation circuitry and signal amplification on a monolithic sili con chip This new pressure sensor is well suited for microprocessor based systems its sensor output scale is calibrated from 0 5 V to 4 5 V In addition it is temperature compensated over the range of 0 C to 85 C The device uses a patented sili con shear stress strain gauge for use over the range of 0 to 15 psi differential pres sure To make the sensor even easier to use it is available in the basic element package single and dual ported ver sions and also with customized outputs
110. dy outline but a different li brary name for example SN74 LS112AN SN74LS112AD SNS4LS 112AJ SNSALSII2AW etc A count of different device types how ever reveals a more realistic library size of about 3 500 devices which is plenty big anyway SS P Y ie ca M Components are called up from the library viaa Windows like dialog box You can either enter the device name at the prompt or choose the part from a menu list The menu list is the better choice because most li brary modules are manufacturer specific with eight modules alone dedicated to Texas Instrument TTL chips and a generic name like 74L S02 won t get you anything but a part not found warning The manufac turer s full device name is mandato ry Multiple part placement is sup ported as is rotate Before you can place a part on the worksheet its library module must be loaded into the worksheet up to 10 library modules are permitted per drawing To reduce the amount of disk space consumed by the library modules which totals 3 6MB for all 23 modules you can extract the parts used by the drawing from their re lated modules and save them in a drawing specific library module 76 MODERN ELECTRONICS January 1991 which now becomes the only library module needed for that drawing Part references can be designated either during or after the part is placed on the worksheet Automatic part naming
111. e ment to troubleshooting and repairing a simple electronic circuit EV 3101 A AC ELECTRONICS Follow up to DC Electron ics Covers the principles of AC voltage and electrical measurement Includes motors generators and test instrument meter movements EV 3102 A SEMICONDUCTORS Complete the DC AC videos and you re ready to learn how semi conductor devices are made plus the principles of discrete devices integrated circuits amp optoelectronic devices EV 3103 A ELECTRONIC CIRCUITS Complete the basic course with amplifier configurations biasing coupling audio amplifiers closed loop vs open loop operation and more EV 3104 A An activity filled workbook and explanation of how to solve each problem comes with each tape so you learn three ways video workbook and hands on Order today Call Toll tree 24 hours a day 1 800 253 0570 We accept VISA MasterCard American Express and Heath Revolving Charge card Use Order Code 601 051 Heath Benton Harbor MI VIDEO TAPES Call for a FREE catalog 1 800 44HEATH 1990 Heath Company Subsidiary of Bull Data yews Inc Price does not include shipping and handling or applicable sales tax CIRCLE NO I ON FREE INFORMATION CARD January 1991 MODERN ELECTRONICS 9 SCIENTIFIC amp ELECTRONIC PRODUCTS disc in the drawer of the player brush GRAI ANTI GRAVITY GENERATOR 10 00 E LT 40 WATT BURNING CUTTING LASER 20 00 s
112. e READ WRITE and I O lines set up the peripherals so that they can supply or accept data as required by the CPU The system s 8K program ROM U10 is at memory locations 0000 through IFFF all locations are in hex format The ROM stores pro gram steps and fixed data tables The system s 8K RAM U8 is mapped from 8000 through 9FFF The RAM holds display data and otaer vari ables used by the program It is not necessary to understand the hex numbering system to continue but if you are serious about learning build ing and designing computer type cir cuits you must get some of this be hind you Memory amp I O Address Decoders The 74HC139 U4A in Fig 2 is a memory map decoder This chip pro duces a low level output at pin 4 whenever the CPU wants te talk tosystem RAM A low level at pin 5 is generated when the CPU is reading an instruction or data from the sys tem s program ROM Exactly how these decoders work will be part of one of the experiments you will be conducting in an upcoming issue The I O decoder a 74HC138 U3 Operates in much the same manner except that when the CPU is address ing an input or Output port the se lected port will get a signal from the I O decoder which connects the port to the system s data bus This simple part permits up to eight different ports to be addressed by the CPU This design uses only three ports I O Ports e Display Data Shift Register The first
113. e at the same time Components can be called from the library only by entering the names from the keyboard You can assign complete schematic references at this time including part value and up to six lines of additional text Its post processor s Design Rule Check identifies duplicate device referenc 50 MODERN ELECTRONICS January 1991 es among other design errors Refer ence lines can t be moved or hidden There s no component repeat function Each device placed on the worksheet must be called up individ ually However Schema s copy com mand lets you make multiple copies of a part already on the drawing but you ll have to use the image editor to change part reference names because they re also duplicated Although Schema has no parts orientation editor different orienta Say You Saw It In Modern Electronics tions are stored as separate devices in the component library as are the De Morgan equivalents Each orienta tion has its own name which you specify at the time you call up the part After a part has been placed on the drawing you can use the rotate command to step it through its vari ous library orientations Wires are drawn by holding down the right mouse button and scooting the rodent to the desired location Releasing the button places the wire on the worksheet pressing the but ton again starts a new wire Diagonal lines drawn at any angle are made by selecting the diagonal line option from th
114. e menu There s no bus draw ing or editing function but buses can be created using the thick wire and arc menu options in conjunction with a repeat command that places the breakouts at user defined intervals Autopan is smooth scrolling and the speed of the scroll is adjustable as is the grid s dot spacing Unlike some schematic capture programs you can choose your zoom size from a menu rather than having to step through each zoom level one by one Its zoom range to 8 x however isn t as powerful as the magnification op tions of most other packages Editing features are average and consist of move delete and copy Objects can be edited individually or as blocks Absent is a mirror image function which has to be accom plished with some editing efforts Schema has an on line help screen Help is context sensitive matching the help message to the current com mand and is available for both the screen and library editor Like some other software ex amined here Schema supports sever al popular netlist formats with con version files in BASIC Among the 14 netlist output formats supported are SPICE EE Designer and Future Net Also DXF files need conver sion for inputting In addition to the standard ASCII format the Bill of Materials BOM EC m EE Ee SS c U G B cmmmpmcaMDI TC MM mr rw s P pM e netlist can be output in Lotus dBASE and SDF f
115. eaker e SP 50B Mobile speaker e HS 5 Deluxe head phones e HS 6 Lightweight headphones KENWOOD U S A CORPORATION COMMUNICATIONS amp TEST EQUIPMENT GROUP PO BOX 22745 2201 E Dominguez Street Long Beach CA 90801 5745 KENWOOD ELECTRONICS CANADA INC P O BOX 1075 959 Gana Court Mississauga Ontario Canada L4T 4C2 KENWOOD pacesetter in Amateur Radio CIRCLE NO 10 ON FREE INFORMATION CARD
116. ectations of a flat high res olution television screen will likely soon be fulfilled e CPU Thesystem CPU selected for our DSO is a high speed CMOS ver sion of the 8085 It has the advantage of requiring a minimum of current and is capable of operating with a 10 MHz clock input High speed is a necessity to meet the refresh require ments of the display Also the sys tem needs only a minimal amount of support chips see Fig 2 The 8085 is an eight bit processor with a data bus that is eight bits wide Inputs to and outputs from the CPU consist of eight different signals that aretransferred simultanequsly on the data bus Notice that the bus is la beled Apo through AD7 This is be cause these pins also carry address in formation addresses 0 through 7 This scheme is known as multiplex Say You Saw 1t In Modern Electronics ing the signal pins Generally the CPU sets up the addresses first They are then latched into external address latch register UJ When addresses are stable the CPU issues an ALE address latch enable pulse at pin 30 that latches the addresses into the latch During the rest of the bus cycle the signals are data signals Having a dual trace scope you can add a second channel to our DSO for less than 100 or log ic analyzer is the only way to view this complex signal train The rest of the CPU is straightforward High order address lines A8 through AI are valid during the entire bus cycle Th
117. ected class se lected and bargraph tuning Lighted legends indicate which functions are active The IR remote transmitter du plicates most of the control functions available at the receiver 480 CIRCLE NO 9 ON FREE INFORMATION CARD 10 MODERN ELECTRONICS January 1991 Say You Saw It In Modern Electronics frequency ratio time interval and totalize measurement functions Its temperature compensated timebase is designed to provide reliable per formance in changing ambient tem perature environments The CDC250 can be used as a stand alone calibration tool or as a rack and stack component in a bench setup Except for a rotary trig Continued on page 78 intosh computers is available from Ansan Industries Arlington Heights IL The I O Port System is said to be ideal for automating most electrical ly operated devices in the home It can monitor fire and security sys tems operate automatic sprinklers program lights to turn on and off etc AM that is needed to accomplish control is a main control system module called a Bridge The Bridge reads monitors controls and re cords signals using analog and digital input output channels It can be programmed to control any devicein any time frame desired Even if the Hz to 175 MHz at input levels rang ing from 20 mV to 24 volts peak It also provides period measurements ELENCO amp HITACHI PRODUCTS AT DISCOUNT PRICES m RSOs Real Time amp Storage Os
118. ectronic Assemblies P O Box 2264 Alliance OH 44601 216 821 7574 FREEDOM Start your own electronics busi ness 1990 Asian wholesale electronics direc tory lists hot overseas sources 4 95 Ankh Technology Box 4124 Dept M Ann Arbor MI 48106 Say You Saw It In Mocern Electronics Cable TV Descramblers If you find a better deal we ll better our deal mon Jerrold Tocom Hamiin Oak Sclentific Atlanta Zenith Ask about our extended warranty program COD Visa M C welcome Free Call Free Catalog Video Tech 800 562 6884 3702 S Virginia St Ste 160 304 Reno NV 89502 CIRCLE NO II ON FREE INFORMATION CARD FOR THE CONSTRUCTOR CONSTRUCTED OF ALL RACK CHASSIS ALUMINUM PARTS THE FRONT amp REAR PANELS ARE CLEAR BRUSHED ANODIZED THE BALANCE OF THE PARTS ARE MODEL SIZE H W D J PRICE TRUS 175x19x5 28 00 TRU 1 75 x 19x 7 30 00 1RUIO 1 75 x 19x 10 32 00 2RU5 350x19x5 30 00 32 00 34 00 38 00 40 00 42 00 2100 WARD DR HENDERSON NV 89015 U S A 702 565 3400 FAX 702 565 4828 EARN YOUR THROUGH HOME STUDY Our New and Highly Effective Advanced Place ment Program for experienced Electronic Tech nicians grants credit for previous Schooling and Professional Experience and can greatly re duce the time required to complete Program and reach graduation No residence schooling re quired for qualified Electronic Technicians Through this Special Progra
119. ed at a minimum of 10 watts to effectively dissipate the heat generated by the dropping action With the 1 5 microfarad capacitor shown in Fig 1 for C7 and a 5 1 volt l watt zener diode used for D5 the output will be roughly 5 1 volts 52 MODERN ELECTRONICS January 1991 which can be used to power TTL and some CMOS logic circuits and a wide variety of analog circuits Changing the value of C to 2 2 microfarads and replacing D5 with a 12 volt 1 watt zener diode yields a supply with a 12 volt output that can be used to power most analog circuits and a wide variety of CMOS circuits In ei ther configuration the circuit will deliver approximately 50 milliam peres at its output Bear in mind that increasing the value of C reduces the reactance of the capacitor As seen in the above formula the reactance of the capaci tor is independent of the current The higher working voltage capacitor to use in this part of the circuit comes in a fairly small package and a variety of capacities A slight increase in current deliv ery capability of the power supply can be realized by reducing the value of R1 or increasing the value of input filter capacitor C2 A relay or light emitting diode that might require Say You Saw It In Modern Electronics PARTS LIST Cl Monpolarized 250 W V capacitor select value according to amount of voltage to be dropped see text suitable capacitors are available from Digi Key 701 Brooks
120. er you ll also want to keep the 40 page library catalog close at hand because there is no on screen listing for the devices Components are called up from the library by typing their names into a component reference box in one of the many menu paths Multiple Say You Saw It In Modern Electronics ein atvie font acoltd LOAD wO v T e ue a 99 pare eS s HH ne change Copy Move Bteeteh Erase Origin Rotate Zaca gt E oo mmm gon Pe Masa t lico Limp Module lest lori Text PPTPS g AIL t 22 PE Sirzez2v free NET MEM EMILE ILL Tt Gite Kise amp SCHEER 59i i SuperCAD Tango Schematic Series II placement of a part can be made us ing a single mouse click New parts are added by erasing the old part name from the component reference box and entering the library name of the new device Components can be rotated and mirrored during or after placement EE Designer also has an automatic parts placement routine that optimizes the parts location on the drawing after you ve entered them but the layout isn t always the most practical for a schematic and the function is really intended to ben efit the PCB layout section of the program References to the device can be placed on the schematic at the time Say You Saw It In Modern Electronics the part is laid down or after the drawing is completed If you choose the automatic naming rout
121. er servicing techniques as you take command of the full power of your computer s high speed 80286 microprocessor In no time at all you have the confidence and the know how to work with troubleshoot and service every computer on the market today Indeed you have what it takes to step into a full time step DIGITAL MULTIMETER Professional test instrument for quick and easy circuit measurements NS Clearcut illustrated texts build your understanding of computers step by AT COMPATIBLE COMPUTER 80286 CPU 12 MHz clock 0 wait states 1 meg RAM expandable HARD DISK DRIVE 20 megabyte hard disk drive you install internally for to 4 meg 1 2 meg high density floppy disk drive greater disk storage capacity and data access speed SOFTWARE Including MS DOS GW BASIC word processing database and spreadsheet programs money making career as an industry technician even start a computer service business of your own _ Voice synthesis d training adds an j exciting new dimension to your computer skills Now NRI even includes innovative hands on training in voice syn thesis one of today s most exciting and widely applied new develop ments in computer technology You now train with and keep a full featured 8 bit D A converter that attaches in line with your computer s parallel printer port in school on the job how to troubleshoot and TECHNICAL MANUALS You get
122. et R26to maximum Chip U26 is a sim ple high speed comparator TRIGGER SLOPE switch SW1 simply reverses the and inputs When the in put is higher than the input the output will be 5 volts If the in put increases to the input level output drops to 0 volt If you start with the input higher than the input the opposite occurs The normal trigger signal must go from 0 to 5 volts to start the ad dress generator circuit which will be described later You can use TRIG GER SEL Switch S4 to select which in put will trigger the system Choices are Channel A Channel B Logic Analyzer Signal 0 or some external 4 1 2W C25 C26 T 2 2ur aw 22UF 16V 12V C27 T 2 2vF o S VOLTS OVOD RS O 12A 47 1 20 O Vy c29 c28 oy Se 2 2UF 22 UF 16V as 12 VOLIS i EM v C 1UF BYPASS CAPS c2 cs C4 CS c6 c cg C9 C10 C11 C12 C13 C14 C15 C16 C1 C18 C20 C19 C23 C21 Fig 6 Power supply required is straightforward in design Say You Saw It In Modern Electronics 20 MODERN ELECTRONICS January 1991 Oba TD 3sve 1 753 Yo Oe pz ssrt er Ot S ML SE a 4 D 2992 EL A O k _ 2 2 32 phla o SE j P7991 ELhlo o c zeae TO OTE P ge Rho ISL 7 3u t sere o Z sue sa Oe 4 7 3u2 Or B7 3uf sao w Z ws Oey w 9O171 1 2 wr TS Oey Zx IS OR 7 Xn59 119 7 3 51 ore 91 lt P j C oZ
123. et with no references Refer ences are assigned in a separate step in the order in which the parts were placed on the worksheet Each type of device is handled separately with resister annotation a separate step from IC or capacitor assignments Each part has only one reference line Continued on page 76 January 1991 MODERN ELECTRONICS 51 Project Power Supply for IC Experimenting An ac operated transformerless dc power source that can be used for powering small low power circuits and projects By Walter W Schopp ou ve just finished bread Y boarding your latest circuit and are ready to give it the smoke test by connecting power to it and observing how it operates You look around for a suitable pow er supply and decide that because the circuit consumes low power a battery supply will do But you dis cover that you have no battery on hand What to do The solution build the novel power supply de scribed here This power supply does not use a power transformer nor does it re quire exotic or expensive compo nents to put it together In fact you probably have all the components you need on hand save a suitable zener diode Once you proof your circuit and are satisfied that is oper ating as expected you can perma nently incorporate this power supply into the final design if it is to be ac line powered About the Circuit The basic circuit configuration for the power supply i
124. ey can also represent first class COMPUTER CHOW that is the stuff that all computer programs and data are made up of CD ROM however offers something that few other methods of computer stor age can provide While the average audio compact disk may offer 60 to 90 minutes of music the same size CD ROM can hold between 250 and 800 megabytes of programs and files depending upon the format and encoding method used When you convert these figures to the equivalent number of floppy disks which on the average hold just over a megabyte each it s easy to see why CD ROM is such a wonderful medium for distribution of some types of computer information In looking at CD ROM though it s important to keep in mind that this type of storage can t be directly compared to floppy and hard disks Both of these oth er mediums are read write capable When the information is no longer of val ue or interest or if it must be updated the information and or programs residing on the disk can be erased or changed On a CD ROM the data is physically im pressed into the media at the time the CD is created or pressed In fact the de vice that connects to your computer has read only capability it has no electronics or capability for generating a physical change on the media You can of course buy devices with this capability they re called WORM Write Once Read Many drives A WORM drive uses media similar to a CD ROM but in
125. f Supply and Demand You Demand MCM Electronics Say You Saw It In Modern Electronics We Supply You demand a huge selection of high quality audio video and computer parts and components shipped quickly without backorders support from a staff of knowledgeable sales reps phone in technical assistance when you need it and convenient payment terms NO PROBLEM when MCM is YOUR electronic resource For A FREE ONE YEAR SUBSCRIPTION to our POWERHOUSE Catalog and unbeatable service I Call TOLL FREE 1 800 543 4330 MCM ELECTRONICS 650 CONGRESS PARK DR CENTERVILLE OH 45459 4072 CIRCLE NO 73 ON FREE INFORMATION CARD A PREMIER Company SOURCE NO ME 57 January 1991 MODERN ELECTRONICS 45 are assigned in the order in which the parts are placed on the worksheet Multiple packages are grouped in se quence beginning with the first ob ject drawn of that type Objects that have manually edited references are assigned a new reference These must be changed back following annota tion if you wish to keep them There are eight user defined reference lines for each part and each line can be moved freely and independently about the screen Any or all of the reference lines can be hidden Wires are placed on the schematic using a six step menu sequence However once a line is started only two mouse clicks are needed to con tinue its path There s a macro function that lets you record often
126. gnals of U25 connect to data lines of data RAM U28 the data side of the U2 input port and to outputs of logic analyzer latch U 9 These chips cannot be ac tivated at the same time The program via Port B of the 8155 supplies signals that select or connect the proper chips as they are required A D converters are se lected only when the AD WR is low This puts the CE1 line at pin 6 low activating U25 and connecting it to U21 while data is collected This oc curs only if you selected Channel A or B and the proper trigger condi tions have been met If you select the logic analyzer the program will supply a low at LOGIC ANALYZER WR pin 1 of U19 Thus logic analyzer inputs are connected to data RAM permitting data col lected to be stored inthe RAM Data RAM U2 transfers data stored in it through a program that places data in the display RAM area It does this in the format required for it to be sent to the LCD display 22 MODERN ELECTRONICS January 1991 Timebase Generator The timebase circuits see Fig 7 are simple enough 74HC393s are used to divide by 10 the input to pins CKB The output at pins QA is a Square wave with 4 the frequency of the in put The 74HC390s divide Input A by 2 at the QA pins and divide Input A by 4 at the QB pins You begin with a 20 MHz oscilla tor and divide by steps of 2 4 and 10 This produces a timebase with indus try standard 1 2 5 separations Out put PCLOCK provides
127. he library by clicking on a menu com mand and typing in the device name at the prompt A screen listing of the library devices is available but only HiWIRE Plus from Wintek Corp for reference Devices can t be se lected from the screen menu which is unfortunate because many device names include case sensitive charac ters example formC isn t the same as formc Every part placed on the worksheet must be typed in in dividually because Hi WIRE doesn t remember the last part entered nor does it have a multiple placement routine Parts can be rotated or mirrored but only after they re on the work sheet However certain combina tions of the positioning edits cause other body parts to overlap and mask one or both references lines neither of which can be moved Parts also have no schematic reference until manually assigned after placement using an edit command Only ortho wires or lines are per mitted no diagonals Once a wire or line is started it can be continued in CCD Computer Camera NEW Thermo Electric Cooling Option The Electrim EDC 1000 All you need to put gray level image data into your computer The EDC 1000 is a small CCD camera 8 bit half size IBM PC card and software combination that captures and digitizes live im ages with up to 256 levels of gray and 192 x 330 pixel resolution ELECTRIM Corporation ELECTRonic IMaging PO Box 2074 Princeton NJ 08543 609 799 72
128. he programs that the Macademic ROM contains vary in suit ability from pre school on up to college level If you have children or are just in terested in widening your own horizons there something in here you ll find inter esting and informative I haven t had thetimeto do much more with these two ROMs than just skim the surface after all it takes time to load and run more than 20 000 pieces of software Yet even with the small sample I ve been able to look at it s obvious that the QL Tech collections are similar in at least one respect to other collections of shareware and public domain software Quality of the individual packages varies greatly There are some packages where you d ask for your money back if you had bought them separately and others that make you wonder how the author could ask for such a small donation because the pack age is equal to or much better than com mercially available software In any case with 15 000 programs on one disk and more than 7 500 on the Say You Saw It In Modern Electronics other you can t go wrong ai the price The CD 7 ROM costs 99 while the Mac ademic disk is a reasonable 149 QL Tech has several other collections of Mac software on ROM that I haven t looked at The Right Stuff at 99 and Mega ROM for 49 You won t like every package on these disks but at the price they re hard to Products Mentioned The Microsoft Office 895 Microsoft Corp One Microsoft
129. icated computer servicing techniques With NRI s unique Discovery Learning Method you re sure to get the kind of practical hands on experience that will make you fully prepared to take E ee McGraw Hill Continuing Education Center 4401 Connecticut Averue NW Washington DC 20008 vi CHECK ONE FREE CATALOG ONLY O Computers and Microprocessors O Robotics O TV Video Audio Se vicing J Computer Programming Name Please Print Age Address School of Electronics Ne TM Accredited Member National Home Study Council advantage of every opportunity in today s top growth field of computer service With NRI you learn at your own pace in your own home No classroom pressures no night school no need to quit your present job until you re ready to make your move And all throughout your training you have the full support of your personal NRI instructor and the NRI technical staff Your FREE NRI catalog tells more Send today for your free full color catalog describing every aspect of NRI s innovative computer training as well as hands on training in robotics video audio servicing telecommunications electronic music technology and other growing high tech career fields If the coupon is missing write to NRI School of Electronics McGraw Hill Continuing Education Center 4401 Connecticut Avenue NW Washington DC 20008 AT is a registered trademark of International Bus
130. ide down and activate play Clean 4 R PU RILLIN ani pg MCP I VELOCITY COIL GUN 15 00 ing is accomplished in about 10 sec tc an N z M q CIN SEN 3 MELIUS T eH onds at which point the player auto H1 NIC HYPNOTISM HNIQU C2 EMLI LOWER POWERED COIL GUN LAUNCHER 8 00 matically stops Audio Technica lt Oe m recommends that it be done at least m once a month more frequently if w your player is subjected to a lot of Z FMVIK 3 MILE FM VOICE TRANSMITTER 34 5 S PFS1K HAND CONTROLLED PLASMA FIRE SABER 48 50 cigarette smoke 24 95 a NIG7K HI FLUX NEGATIVE ION GENERATOR 34 50 amp PG5K PLASMA LIGHTNING GLOBE E 50 Z X LHC2K VISIBLE SIMULATED 3 COLOR LASER 44 CIRCLE NO 7 ON FREE INFORMATION CARD a HOKIK HOMING TRACKING BEEPER TRANSMITTER 44 50 GEME USED Her ANA 123 dry the lens To perform a clean A P 49 50 clea ps 10G2K ION RAY GUN project energy without wires 129 95 cyt s op a p ming I O Port System t TKEIK TELEKNETIC ENHANCER ELECTRIC MAN 79 50 operation you apply a single drop of SZ VWPM7K 3 MILE AUTO TELEPHONE TRANSMITTER 49 50 ASSEMBLED IN OUR LABS ASSEMBLED LISTIO INFINITY XMTR Listen In via phone lines 199 50 IPG70 INVIS PAIN FIELD BLAST WAVE GEN 74 50 ITM10 100 000 VOLT INTIMIOATOR UP TO 20 99 50 TAT30 AUTO TELEPHONE RECORDING DEVICE 24 50 PSP40 PHASOR SONIC BLAST WAVE PISTOL 89 50 ONE1O ALL NEW 26 VIVID
131. ild and experiment with actua circuits choosing from an unlimited number of ccmponents including resistors capacitors inductors general impedence AC voltage sources batteries AC DC current sources Then analyze your circuits with built in high tech instruments voltmeter ammeter ohmmeter oscilloscope wattmeter sweep generator breadboard temperature adjustment and frequency control This complete electronics lab simulates thousands of dollars worth of parts and instruments all built in with easy to use menu driven mouse controlled PROTOWARE software Plus you get a unique experiment book featuring over 75 experi ments and circuits Enjoy countless hours of fun while learning And you won t blow up your lab because it s fool proof and safe on your pc Here are some typical circuits you can build and test Resistor Series Parallel Circuit demonstrates current divisior in a parallel circuit Frequency Compensated Bridge using oscilloscope to measure AC signal offset by DC voltage Order today start building and testing circuits today IBM compatibles require 384K RAM CGA 640x200 video display and mouse Macintosh requires Macintosh 512E MAC XL MAC PLUS MAC SE MAC II Call toll free for details GLOBAL Thevenin Equivalent Circuit eS eee calculating voltage drop and current flow using built in ammeter voltmeter PROTOLAB provides a complete lab station of high
132. imensions 21 4H x 55 8W x6 1 2D Wt 11b AR3000 995 400 Channels 100KHz to 2036MHz Standard Features Extremely compact size Continuous coverage Attenuation Programmable by Channel Manual tuning knob Tuning increments down to 50Hz AM FM wide band FM LSB USB CW modes Backlighted LCD display 4 Scan and Search Banks Lockout in Search 4 Priority Channels e 232 control through DB25 connector Delay Hold Features 15 band pass filters GaAsFET RF amp eSieep and Alarm Features AC adaptor charger DC power cord e Telescopic Antenna Options Earphone EP200 2 00 External Speaker Mobile Mount MS190 19 50 Extended Warranty 2 3 yrs 965 75 Mobile Mounting Bracket MM1 14 90 RS232 Control Package SCS3 295 00 software amp cable offers spectrum display and database Specifications Coverage 100KHz 2036MHz Sensitivity 35uV NFM 1 0uV WFM 1 0AM SSB CW Speed 20 ch sec scan 20ch sec search IF 736 23 352 23 198 63 45 0275 455KHz Increments 50Hz and greater Selectivity 2 4Khz 6db SSB 12KHz 6db NFM AM Audio 1 2 Watts at 4 ohms Power Input 13 8 V DC 500mA Antenna BNC Display LCD Dimensions 31 7H x 52 57W x77 8D Wt 2lb 100z To Order Call 1 800 445 7717 In All 50 States and Canada 24 Hours a Day Fax Orders 1 800 448 1084 24 Hours a Day i ACE Communications Monitor Division 10707 E 106th Street Fishers IN 46038 I
133. ine the parts are numbered in the order they were placed on the drawing with EE Designer grouping multiple gate packages in a sequence that is benefi cial to the PCB layout software Using the library editor you can change move delete or add refer ence lines to a component There s no limit to the number o reference lines you can have their location or their font size provided it s within the scope of EE Designer s general editing skills Parts modified in this way aren t saved back to the compo nent library but are savec in EE De signer s own database along with the drawing files associated with them Lines are started by clicking the mouse button once and moving the wire to its destination Another click of the mouse button changes the di rection of the wire To end a wire you have to go into a menu or use its keyboard equivalent EE Designer III is truly a profes sional schematic capture and PCB laycut package targeted directly at the professional community But it carries with it a heavier price tag in both installation cost and learning time This isn t a package for the oc casional user CIRCLE NO 22 ON FREE INFORMATION CARD January 1991 MODERN ELECTRONICS 41 HY n W w d iM BW y 4 Wn REN was at 4 AA WN aa Bea TIME ae Owe New PROTOLAB a state of the art electronics lab for the hobbyist s student s or engineer s pc Now you can bu
134. ine but don t go to that often Optical drives have huge storage ca pacities but are agonizingly slow in trans ferring data when compared to even a floppy disk Tandy has been talking about its THOR re writeable disk technology for a while now We were sup posed to see a 600 device in 1990 but problems have postponed the introduc tion until later this year or next year When it does appear if it costs less than 1 000 it ll most likely drive the market down to where the technology becomes both affordable for many of us and quickly adopted Leaving out the update capability allows CD ROM readers to be produced and sold at a fairly reasonable cost and prices have come down substantially over the last year When the first CD ROM readers were introduced several years ago most cost between 1 500 and 2 500 a lot of money for a device that had few CD ROMs actually available Today you can buy a ROM reader for between 500 and 900 The Apple ROM drive used for this month s reviews is on the high end costing almost twice the price of the NEC but is also almost twice as fast There are dozens if not hundreds of CD ROMs available with more being in troduced almost daily This came about due to lowering the costs required to pro duce the CD When CD ROM was first in troduced mastering costs of more than 20 000 were common This was an up front cost before the first CD was turned out Being a re
135. iness Machines Corporation For career courses approved under Gl Bill O check for details O Security Electronics O Electronic Music Technology O Basic Electronics O Telecommunications 4 011 OSCILLATOR 1 OSCILLATOR 2 Fig 9 How to make a simple r f marker transmitter with 10 MHz oscillator developing r f carrier and 60 Hz oscillator modulating carrier disable gate that permits the signal to be removed from the outputs without switch ing off the oscillator Incidentally although the ICM7209 is specified for a minimum oscillation fre TOV quency of 2 MHz it works at lower fre quencies For example when I replaced the quartz crystal in Fig 4 with a 455 kHz ceramic resonator also a piezoelectric device the ICM7209 continued to oscil OSCILLATOR L v 4 N 0 B gt t OSCILLATOR Z Q Fig 10 Details for making a simple alternative r f marker transmitter 64 MODERN ELECTRONICS January 1991 late The only problem is that the divide by 8 output became a divide by 1 5 out put due to the dynamic design of the di vider circuit As with semiconductor RAMS static dividers use chains of con ventional flip flops dynamic dividers use tiny capacitors Though originally designed by Intersil the ICM7209 chip is now available for around 4 18 from Harris Semiconduc tor through local distributors like New ark Electronics Precision 60 Hz Timebase Quartz crysta
136. ing of DS If itis not dis connect the line cord from the ac re ceptacle and troubleshoot the circuit to correct the problem Once the circuit is operating prop erly remove power from it and liber ally flow silicone potting compound or adhesive over the section of the circuit board assembly in the loca tions where 117 volt ac line power ex ists on both sides of the board This is to insulate the potentially hazardous portion of the circuit Now house the circuit board as sembly in a suitable enclosure If you built the supply to use exclusively for a project build it right into the same enclosure that houses the project ME Special New Reduced Price FHOTOFLASH CAPACITOR 210 Mid 330 Vok CAT PPC 210 1 25 each 10 for 11 00 100 for 100 00 Large quantities available Call for pricing FLASHER LED Diflused LE D with buik in flashing unit PULSE RATE 3 Hz Q 5 Volv20 ma Unk continually flashes when 5 Volts is Operates between 4 5 Volts and 5 5 Volts T 1 3 4 size IDEAL AS AN INDICATOR RED CAT LED4 GREEN CATS LED 4G gt CAT LED 4Y 1 00 each 10 for 9 50 100 for 90 00 6 Volt 1 Amp Hour HE o RGEA BLE BA TTE RY Z X 1 635 X 2 high Batteries are prepped L an S Back and vd iade terminated wh 2 pin co nector ideal for rec erve power CAT GC 61 4 75 each 10 for 42 50 HEAVY DUTY NICKEL CADMIUM C BATTERY Yuasa 1800C Special purchase of new rechargeable nic
137. ingle quantities Catalogs from Digi Key P O Box 677 Thief River Falls MN 56701 and Jameco 1355 Shoreway Rd Belmont CA 94002 list similar oscilla tors for less than 4 As I was preparing this column I bought several oscillator modules from Marlin P Jones amp Asso ciates P O Box 12685 Lake Park FL 33403 for 3 each All prices mentioned here are real bargains when you consider assembly time and construction space you save Crystal controlled hybrid oscillators have many important advantages Most obvious of course is the fact they re ful ly functional devices that require only a source of power to operate Another is that the crystal and its associated compo nents remain at very near the same tem perature during operation This enhances their stability As for applications the tiny oscillators can reduce the r f interference generated by a circuit since the oscillator can often Q L 2 72 2 2 CRYSTAL GSCILLATORK O CTOP 58 MODERN ELECTRONICS January 1991 Say You Saw It In Modern Electronics COHs S uw PI 55017 7 HOL 1 IO Nha V RZ 1K CED ty Fig 8 Schematic of a precision 1 Hz timebase circuit be located very close or even directly ad jacent to the circuit it controls Since this reduces the length of the transmission line that carries the signal the strength of the propagated signal is also reduced A UJT Oscillator Many very simple
138. ion instructions Sche matics PCB template Parts list diagrams 19 90 Schlitzer 414 Alva Dr Grand Prairie TX 75051 214 642 0338 COMMUNICATIONS MORSE Code No Problem You can in crease your speed no matter how many times you ve failed before Results guaranteed when you follow the instructions PASS Publish ing s CW Mental Block Buster program helps you explode mental blocks that hold you back Based on 40 years of research the CW Mental Block Buster uses guided meditation dynamic visualizations and powerful affirmations to blast through mental blocks You can do code That means new bands more contacts more fun This is not a CW practice tape The CW Mental Block Buster audio cassette and practice booklet are only 24 95 ppd in the US NY residents add 1 87 sales tax Quantity discounts available for classes PASS Publishing P O Box 570 Stony Brook NY 11780 HUGE COMMUNICATIONS CATALOG 88 pages including amateur shortwave and scanner equipment Universal Radio 1280 Aida Drive ME Reynoldsburg OH 43068 PAN COMM INT L CATALOG Over 350 Kits Plans Books about Licensed unlicensed AM FM broadcasting Ham CB SW DX amplifiers 1750M transmitters Surveillance devices Computers Software Science Proj ects MORE 1 00 refundable Box 130 MEI Paradise CA 95967 d O M T F R BUILD 8052AHBASIC Microcontroller 32k ram 16k eprom with programmer 24 channel I O and rea
139. ion work ProCAD has a feature called Quickset that turns off some operating aids to speed up its use for expert users who don t need automatic command prompt lines and other visual aids Quickset has three settings nov ice intermediate and advanced Ma cro commands further simplify com mands Layer assignment colors ProCAD uses 16 colors are excel lent visual aids For instance sche matic symbols are green text is red wire is colored yellow highlighting is white and so on The command line is at the bottom of the screen Moving to one changes its color Clicking or ENTER by key sets up another line of choices related to the command To draw wires you would click on a PLACE command then click on WIRE one of the sub commands displayed You then posi tion the cursor on a device s input or output click and draw wire out by moving the cursor At a point where you wish to change direction you click the left mouse button or press ENTER and continue pulling out more wire When you make a con nection press the right most button or ESC and the job is done signi fied by the white color wire you drew changing to yellow A Status line at the top of the screen keeps visual tracx of settings such as layer number There are 99 layers available think of them as Mylar overlays a color coded layer bar at the bottom of the worksheet allows you to click on any one ac tivelibrary module and so on
140. is amounts to about 1 500 components Any of these can be rotated on command DeMorgan logic gate equivalents aren t provided but the program has the means to create such devices and others The library includes a strong storehouse of surface mount de vices with specific commands for working with them ProCAD requires more than 3MB of free hard disk space With all the optional Library Volumes if bought separately they cost 35 each this minimum is almost doubled In addi tion ProCAD demands most of your 640K of RAM which is not uncommon Using the program for some fair production work I would follow the manufacturer s recommendation and add a math coprocessor For large involved schematic PCB work you ll want to spend another 200 or 250 for upgrading later and get the Pro CAD Xtra XL version which has ex panded memory capabilities that support the LIM EMS Version 4 0 standard If you already have 2MB of memory sitting there that s it Otherwise figure in the extra memo ry and coprocessor cost to get your total price Nevertheless ProCAD incorpor ates a memory manager that shifts data to the hard disk and an overlay cache that it automatically sets up if you have at least 360K of RAM be yond the basic 640K Furthermore it uses memory very economically through clever database memory management that might take up say 20 bytes for a device instead of 512 bytes for a separate file ProCAD s fir
141. is special ty Those of special note this month are as follows Television and Audio Handbook Mc Graw Hill hard cover 640 pages 39 95 by K Blair Benson amp Jerry Whit aker presents the basic data needed to maintain troubleshoot and service state of the art systems Designed as an on the job reference the Handbook ex plains the fundamentals of TV and audio circuit design and performance and of fers details on operation maintenance and testing of systems and components Coverage includes analog and digital sys tems video and audio signal processing speakers and sound systems from micro phone input to sound output design and operation of TV receivers CD and mag netic tape recording and procedures for evaluating system performance You need a lot of shelf headroom for the 8 x ll inch Encyclopedia of Elec tronics Second Edition Tab Profession al and Reference Books hard cover 960 pages 69 50 edited by Stan Gibilisco and Neil Sclater This new edition con tains updated information on virtually every electronics concept and component in existence with stress on recent ad vances in digital electronics and comput er technology Among the new listings are artificial intelligence superconduc tivity fax machines fiber optics laser printers CDs PLDs CAD CAE HD TV barcodes LANs and much more Electronics Troubleshooting To keep the professional service techni cian abreast of latest development
142. kei cad batteries 1 2 volts 1800 mAH PRICE REDUCED ON 10 OR MORE CAT HONCB C 10 pieces for 42 50 4 25 each 100 pieces for 375 00 3 75 each Experimentor s Delight COHDLESS TELEPHONE TRANSCEIVER d IT e Phonemated IQ4210T Tem Base station for a cordiess Nee ini this transceiver contains hundreds of useful parts includes power transformer ls 600 ohm phone coupling transformer crystals heat sinks voltage regulator power cord phone cord and Jack relay and 30 telescoping antenna The beige chassis box has only a few holes in the back panel and would be an excellent housing for other projects 7 25 X5 87 X 2 15 CAT PMB 1 3 75 each SOLD AS S For Parte Only No returns accepted PHOTO HESISTOR 100 ohms light 16K ohms dark 0 182 dia X 08 high 0 18 lang leads CAT PRE 7 2for 1 00 I BOO d ORDER LINES TERMS Modan order 10 00 Shipping and handing for the 48 continental U S A 3 50 per order All others including AK HI PR or Canada must pay full shipping All orders delivered in CALIFORNIA must include state sales tax 6 1 4 6 3 4 7 1 4 Quantities Limited NO C O D Prices subject to change without notice Call or Write For Our FREE 60 Page Catalog Outside The U S A Send 2 00 Postage ALL ELECTRONICS CORP P O Box 567 Van Nuys CA 91408 CIRCLE NO 20 ON FREE INFORMATION CARD January 1991 MODERN ELECTRONICS 53 Project Code Practice
143. latively low volume item almost killed CD ROM before it even had the opportunity to get launched Realizing this CD manufacturers have made an ef fort to bring mastering costs down and software to help in creating the tape or disk has become very affordable in the range of 500 to 1 000 With the up front costs coming down to a reasonable level more companies are able to take a chance on releasing applications and databases on CD ROM Last year was a boom year for CD ROM with numerous titles and interesting applications appearing regularly And this year appears like it might be even better Yet the bottom line for many users won t be the cost of the CD ROM itself though in some cases such as Microsoft s Office reviewed below this can be substantial To be able to even use a CD ROM still requires a fairly hefty investment in a ROM drive And unlike a hard disk this peripheral has no other use beyond allowing you to use CD ROMs that you purchase Before you run out to buy a ROM drive take a good look at the applications that are available on CD ROM for your par ticular system The pivotal question you ll have to answer is Are these applications 66 MODERN ELECTRONICS January 1991 Say You Saw It In Modern Electronics important enough to me to warrant laying out another 500 or more just to use them For many of you the answer at this time will probably be no For some of you applications such as Microsoft
144. ll the how it works informa tion Schematics photos drawings printed circuit guides and the parts Sources to make it a snap to build al most 50 useful unique electronic de vices at modest cost Discover how these circuits and mod ern electronic devices perform their ma gic Learn practical electronic technol ogy the painless way and enjoy doing it All projects are based on material pub lished in Modern Electronics with up dates and revisions They ve been built and tested by the original authors Chapters are divided into Intro To Elec tronic Projects Home Electronics Audio Video Electronics Security Elec tronics Computers Test Equipment and Electronic Designing There s Something for everyone Look at what you can build and take pride in Digital voltmeter accessories high frequency ac probe true rms adapter temperature probe Car projects anti theft alarms en gine tachometer Life saving detectors gases amp mi Crowave leaks tem ere n WAT o BOOKSTORE GREENVILLE NH 03048 Name dic Address City P State Zip _ Dazs Check MasterCard VISA CardNo Expires Signature Signature required on all charge orders I ELECTRO ELECTRONICS FUN PROJECT BOOKS Order am books and pa Only 22 9 d Plus Shipping Second book of Modern Electronic bun Prore lt ts i Computer system power controller Dual pulse generator Surr
145. ls are generally considered to be most useful as providers of high fre quency signals But don t forget that digi tal watch on your wrist Virtually all such watches have a 1 Hz output that drives the seconds display Even though digital watches have be come extremely inexpensive it s hard to find oscillator modules that operate at 1 or 60 Hz One option is to use an MM5369 to make your own 60 Hz time base This chip is installed in an eight pin mini DIP It s most interesting feature is that it uses a 3 58 MHz TV color burst crystal instead of the considerably slower 32 768 kHz crystal used in most digital watch and clock oscillators Assuming that the tolerances of a pair of oscillators operating at these two frequencies are identical the faster oscillator should pro vide the greatest degree of accuracy when the signal is divided down to 60 Hz The circuit for the 60 Hz timebase is shown in Fig 5 For best results connect a frequency counter to the output of the circuit and tune C2 with a small screw driver until the oscillator output is as close as possible to 3 579 545 Hz As with the previous circuits you can experiment with the various outboard components If you can t find a 20 meg ohm resistor for R7 use two 10 megohm resistors in series Using Hybrids When first introduced hybrid crystal os cillator modules might have been beyond Say You Saw It In Modern Electronics N C L SE Fig 11 Schem
146. lso avail able to expand the utility of the Ex perimenter Lab see the Note at the end of the Parts List An analog function generator and a digital sig nal generator in upcoming issues will round out the laboratory preparing you for a host of new technology learning experiences A stimulating aspect of this project is that we can use the scope to look in side the scope itself and see how most of the components used actually function Seeing is believing and doing helps the learning process Be fore describing how the scope you will build works let us discuss what that instrument can do cannot do and how it compares to commercially ee ILE T8 LCO_D EAE LEE Pe a t OC RINE Drite LRTCH Pata flock LM24013M LCD DISPLAY 240 DATA SIGNALS CHIGH OR LOW CLOCKED IN DURING G EDGE OF LCD DATA DATA IS C FALLIN DATA CLOCK SIGNAL DATA LATCH ENTIRE ROW C240 DOTS LATCHED IN WITH THIS PULSE available scopes The DSO Project AC DRIVE ALTERNATES PeLARITY EACH FRAME 64 ROMS This project is known as a Digital Storage Oscilloscope also known as a DSO This means that input signals are converted by an analog to digital A D converter to a digital signal and then displayed on a screen A standard analog scope uses the input to move a beam on the screen to pro duce this display The major advan tage of a DSO is that an event can be saved or frozen on the scope screen giving the user time to e
147. ltime clock Kits contain pc board and all components complete manual with schematics Kits start at 175 00 call for in formation NEWTRONICS 9896 50th St W Veseli MN 55046 507 744 2015 FOR SALE Trice in circuit emulator 499 Tango schematics software 399 EPROM programmer never used 299 Will pay ship ping 704 633 6767 80 MODERN ELECTRONICS January 1991 EQUIPMENT assortment Electronic com puter test descrambler Catalog 3 00 Re fundable B amp R Enterprise P O Box 662 Portage MI 49081 PROTOQUICK Z8 single board computer with prototype area 69 00 Software Sci ence 3750 Roundbottom Road Cincinnati OH 45244 513 561 2060 FREE IBM SOFTWARE CATALOG 2000 Disks Toll Free 1 800 345 2983 24 Hours In Colorado Please Call 303 934 5507 MEG A BYTE INC PC SOFTWARE SUPPLY 3601 Morrison Road Denver CO 80219 FAX 303 936 7049 CABLE TOCOM VIP TEST CHIP For Models 5503 VIP and 5507 Unlike any other turn on this one works Easily installs in just seconds 50 00 each No Calif sales Call 213 867 0081 CABLE DESCRAMBLERS Jerrold 400 450 Tri Bi SB 3 Scientific Atlanta Oak To com Lowest Prices Example Jerrold from 25 00 No Calif Sales Call us last and see 213 867 0081 ZENITH Z Tac Special test board installs easily in minutes and turns on decoder for all modes Great for flashing problems Only 50 No Calif Sales Call 2
148. m you can pull all of the loose ends of your electronics background together and earn your B S E E Degree Up grade your status and pay to the Engineering Level Advance Rapidly Many finish in 12 months or less Students and graduates in al 50 States and throughout the World Established Over 40 Years Write for free Descriptive Lit erature COOK S INSTITUTE OF ELECTRONICS ENGINEERING CIRCLE NO 13 ON FREE INFORMATION CARD E 4251 CYPRESS DRIVE JACK SOM MI SSISSIPPI 39712 January 1991 MODERN ELECTRONICS 79 Cable Converters And Descramblers Why Pay a High Monthly Fee For FREE Catalog Call or Write CABLE CONNECTION 1304 E CHICAGO ST SUITE 301 ALGONQUIN IL 60102 708 658 2365 No Illinois Orders SURVEILLANCE TELEPHONE Monitor room conversations 175 00 Monitor room amp telephone conversations 275 00 Dialer tap calis you when phone is used 305 00 Range Unlimited 6 month warranty Phone Tap Catalog 3 00 LISTEN RECTAONICI 603 Elgin Muskages OK 74401 1 800 633 TAPS Order Back Issues of CABLE TV CONVERTERS Attention Cable Viewers Jerrold Zenith Oak Scientific Atlanta Hamlin Tocom and many others C R BEST PRICES 1 800 826 7623 S B amp B inc 4030 Beau D Rue Dr Eagan MN 55122 EZ z X s 20 MHz FREQ 3 UNTER vot Ca KELVIN __Electronics cmm Fairchild Ave Plainview NY 11803 516 T 7620 1 800 645 9212 X 516 349 7830 iod
149. med of before As the leading school in 10me study electronics CIE has helped over 150 000 siudents in the U S A and over 70 foreign countries get started in this exciting field To find out how CIE could be helping ou read on then send for a CIE catalog TODAY A Growing Need or Trained Professionals The career opportunities shown here are only a few of the challenging high paying careers you could enjoy as an electronics technician You could be the brains behind the scenes of an exciting TV broadcast trouble shoot life saving medical equip ment design exotic new aeronautics systems CIE s job oriented programs offer you the quickest possit le path to Automotive Electrenics Computer Assisted Manufacturing Consumer Electronics Military Electron cs At Your Own Pace amp In Your Own Home Practical Training At Your Own Pace Through CIE you can train for your new career while you keep your pres ent job Each course allows a gener ous completion time and there are no limitations on how fast you can Study Shculd you already have some electronics experience CIE offers several courses which start at the intermediate level State 0f The Art Facilities amp Equipment In 1969 CIE pioneered the first elec tronics laboratory course and in 1984 the first Microprocessor Laboratory Today no other home study school can match CIE s state of the art equipment And all your labor
150. nd intervals Crystal oscillator circuits that operate at radio frequencies are well suited for calibrating communication receivers Many of the circuits described thus far can be used for this purpose But among my favorites is the circuit shown in Fig 9 Here the output of 60 Hz and 10 MHz crystal oscillator modules are tied to gether and connected to a short wire an tenna The result is a 10 MHz marker modulated at 60 Hz I can t say if either module can be damaged by operating them in this fashion A connection in which the output from the 60 Hz oscilla tor controls the power applied to the 10 MHz oscillator is shown in Fig 10 Both the Fig 9 and Fig 10 circuits pro duce a very clear and distinct 10 MHz marker signal If you first tune the receiv er to the 1O MHz WWV time signal the 60 Hz marker signal will be superim posed directly over the WW V signal when power is applied to the 10 MHz oscillator One of the most clever electronic cir cuits ever devised is the crystal controlled frequency synthesizer Figure 11 showsa very simple version of such a circuit that you can easily assemble and test In oper ation a crystal oscillator is connected to the input of the circuit The frequency of the oscillator shouldn t exceed the maxi mum frequency response of the 4046 and 4017 The 4017 is connected here as a pro grammable divide by n counter which is inserted into the loop between the volt age controlled oscilla
151. nnel B or both artk 4 elu d vb WIE ag ait VI REDD HU aT ESTA F obe Cn TETTE H ETERNE 5 gt F Hi HE pars cse a a Ei ar t ee Wie volTo ak na eT ale PR ae CUTEASBBEEIM E TELS ee ee Pret ES Fig 5 Circuitry is provided for connecting into the system an optional Channel B circuit via its a 28 pin bus connector Port B is initialized as an output port Signals generated at these out puts clear the address counter direct the data RAM read and write modes select the logic analyzer or the analog inputs and control the trigger enable logic that is used in the single sweep mode Port C is also set up as an out put port Signals here produce the logic to control display action as described earlier The timer is pro grammed to produce a square wave output with the frequency needed to clock the data out of the U2 shift register and into the display Data RAM Input Ports The last ports to be reviewed are those that read data collected by the data RAM Referring to Fig 3 note that OUTPUT CONTROL pin 1 of U2 goes low when inputs to U6D are high The 8155 supplies one of the signals to CHAN A or LA which goes high when the unit is displaying either Channel A or logic analyzer signals The other in put to U6D is I O select line CZ FX which is generated by the I O decod er discussed above When the CPU wants to read this data RAM it issues the signals that conne
152. nt l Voice 317 842 7115 Int l Fax 317 849 8794 Service and Support Lines Mon Fri 9a m to 9p m Saturday 10 4 EST MasterCard Visa American Express Checks Approved P O s amp C O D add 5 00 Prices and specifications subject to change J CIRCLE NO 52 ON FREE INFORMATION CARD Say You Saw It In Modern Electronics January 1991 MODERN ELECTRONICS 31 Project The Watt Watcher By Dennis P Blum CET he kilowatt hour meter your local utility company installed on or in your home measures electric power consumption How ever being an accumulating device it is not overly useful for the home owner who wants to monitor power used for conservation purposes The Watt Watcher described here on theother hand displays actual power usage in kilowatts from moment to moment without ambiguity Any change in load such as a refrigerator switching on or a lamp being switched off immediately registers on a built in meter movement The metering system consists of two inductive pickup devices you mount inside your electrical service box no potentially hazardous con nections are required and a remote indicating panel meter and driving circuitry The circuit is self powered eliminating any need for a battery or connection to the ac line About the Circuit Shown in Fig 1 is the complete sche matic diagram of the Watt Watcher NOTE Fig 1 Complete schematic diagram of ci
153. nt sounding tone output to E make your practice sessions as com fortable as possible All components wire in series with each other Phone jacks J and J2 permit the headphone and telegraph key to plug into the circuit Potentio meter R serves as a volume control while battery B provides power Using the CPO without a head phone the sound level from PB can be adjusted via R from very low to quite loud So you can use this proj ect in a room to key out dots and dashes for practice sessions with other aspiring hams Alternatively you can use the headphone for pri vate practice 54 MODERN ELECTRONICS January 1991 Construction As shown in the photo the Code Practice Oscillator can be built into just about any enclosure that will ac commodate all the components ex cept key and headphone The proto type was built inside a plastic end cap that fits over the end of 4 inch PVC pipe You can use a more traditional project box if you wish If you plan to use your CPO for only group practice you can replace Jl with a wire that goes to the two points this jack would normally oc cupy Also if you wish the CPO to run continuously at full volume re Say You Saw It In Modern Electronics PARTS LIST B1 9 volt alkaline battery J1 Shorting type single circuit phone jack J2 Non shorting type single circuit phone jack PB1 Piezoelectric buzzer see text R1 25 000 ohm
154. o Join Publishers Prices Shown is followed by a P for paperback ELECTRONICS BOOK CLUB Blue Ridge Surrmil PA 17294 0810 1991 ELECTRONICS 8OOK CLUB CLEAR CIR ADDRESS GENERATOR DIS RAM RW DISP RAM RD GR EX J TRIG ENABLE J NORMAL IRA R27 4 7K AUTS TRIZ gt R20 74HC32 4 7K IAD CLOCK 74MC 4 C 2 qi O 1 000 DD Z CVIDADDED T4 READ ADI Fig 8 Circuit details for data RAM address generator Say You Saw It In Modern Electronics 26 MODERN ELECTRONICS January 1991 signal generated by the CPU This sets the counter s outputs which are the address signals to 00000000 Every input count high to low transition increments the address by one Every 16 counts produces a binary 111 to appear at the inputs of U32A This produces a high at the output of U32A The very next count produces a low going pulse at the output of U32A thus generating a count at the input of second counter U29B When the second counter reaches 16 counts all outputs are high or 11111111 Consequently addresses generated increase from 00000000 to 11111111 binary from 0 to 255 deci mal or from 0 to FF hex After reaching the last address the output of U32B goes high signaling the CPU via the READ AD signal that the data RAM is waiting to be read and displayed Input counts to the counter are generated by either the AD CLOCK or
155. o the public domain Shareware is generally distributed at nocost but if you use it and like it enough to continue us ing it you re expected to pay the authora small fee Of course the author has no way to enforce this fee but if enough people continue to use shareware without paying for it the author won t be able to afford to continue to update it support it or write new software Thetwo collections overlap somewhat containing some of the same software In general though the CD 7is a more eclec tic collection It contains utilities tele communications packages art draw and clip art desk accessories games Hyper Card stacks music packages and a lot more In fact the CD 7 ROM contains more than 719 megabytes of software and more than 15 800 files The index alone exceeds 130 pages when printed out The Macademic ROM is also an ambi tious undertaking It contains about 7 500 programs most of which have an educational slant It includes tutorials games demonstrations and simulations in the areas of art music mathematics science reading spelling religion for eign languages and others Again most of these programs are either in the public Say You Saw It In Modern Electronics OL Tech has c number of CD ROM offerings that Apple Macintosh users will find interesting domain or shareware the remainder are demo versions of commercial software and the index is in excess of 130 pages when printed out T
156. ocks and buses There s also a clean up routine that removes duplicate wires but doesn t catch duplicate parts Context sensi tive on line help is available Tango supports only its own netlist format at this time This shortcom ing ties you to Tango PCB products unless another brand PCB layout or simulator software includes a Tango netlist converter Netlists can be checked for drawing errors using a Design Rule Checker utility Printer output is just short of fan tastic with control over all aspects of the hard copy page including image resolution colors for printers that support them and sizing a drawing to fit the printer page But this print er driver is no miracle worker It will refuse to print an E size drawing on an 8 by 11 inch page for obvious reasons Plotter control is equally good In conclusion 7ango Schematic is an excellent schematic capture pro gram with many drawing features and much versatility But plan on using it with Tango s PCB layout software if you need a complete PCB design package because the sche matic package doesn t include netlist conversions CIRCLE NO 29 ON FREE INFORMATION CARD schematic Program Drawing Editi EE Designer III A A incl PCB amp Simulators 995 HiWIRE Plus C D incl PCB 895 OrCAD B B 495 ProCAD Xtra A A Incl PCB 945 Protel A A 495 Schema III B B 495 SuperCAD B B 99 Tango B A 495 apture Rating Summa
157. ormats This al lows the user to perform spreadsheet and database operations on the BOM data such as cost analysis and inven tory control While you can t size the drawing to the printer page an A size drawing uses only about one third of the page you can take advantage of the printer page by using a C size work sheet for 84 inch printers and an E size worksheet for 15 inch printers when drawing the schematic By con trast the plotting utility gives you full control over page sizing reduc tion and offset Although Schema III doesn t have quite as much refined drawing and editing capabilities demonstrated by some packages in this review it s a well rounded schematic capture pro gram that interfaces with many pop ular PCB layout and circuit simula tion programs and is quite accept able for light production work CIRCLE NO 27 ON FREE INFORMATION CARD m gt AEEEEENNEE 0 A M SuperCAD from Mental Automation At 99 SuperCAD is the lowest priced schematic capture program here But don t let the low price fool you This package has a nice comple ment of drawing and editing fea tures and is easy to use It s the only program here that doesn t operate in multi color mode But on a color monitor it produces an easy to read blue background with white drawings and text And naturally it doesn t match the much more costly programs in terms of component library netlist support for other programs an
158. otLine database of phone numbers on my PC for a while and just installed the company s new HotLine 800 a database of toll free numbers and really like their products Another resource you ll probably find useful if you don t already have it is Microsoft s Quick BASIC interpreter for the Mac This is the full working version not a demo and lets you create your own BASIC programs GOfer from Microlytics is another use ful utility This installs as a Desk Access ory and lets you scan a hard disk CD ROM or file server for a particular text string When you have as many files on your systems as I usually do it s easy to forget exactly what s in each file even though the Mac lets you use longer more descriptive file names than MS DOS eight character file label GOfer is a real time saver when it comes to locating a file where you recall the subject matter but not the file name There are lots of others some of which may be more useful for your purposes than others They re all described in a HyperCard stack a sample of which is re produced here One of the major ways that Micro soft s Office differs from many other Mac applications and PC applications as well is in the documentation It s all available on line in the form of Hyper Card stacks These HyperCard stacks can be installed on your hard disk as part of the installation procedure Installing the help stacks on your hard disks allows you to access the help mu
159. ou use a hacksaw clamp five or so laminations between two pieces of lumber and secure in a bench vise while cutting In either case once you have removed all cen ter bars make sure each lamination is as flat as possible Then stack the now C laminations in two separ ate and equal piles and tape them to gether Do the same with the P laminations Around each I lamination stack wind 350 turns of No 26 magnet wire There is no particular need to be neat about the windings but the neater they are the more compact the assemblies If you wish you can cut pieces of corrugated cardboard and place them at opposite ends of the I laminations to serve as bob bin ends as shown When you finish winding both coils secure the winding in place with electrical tape Then carefully scrape away all enamel from both ends of both coils for a distance of 4 to 1 inch and tin with solder Dimensions shown in Fig 2 are for reference purposes only Your as sembly may have different dimen sions depending on the particular power transformer used Any differ ence in output voltage can be com pensated for during calibration by se lecting appropriate values for the three resistors Temporarily set aside the pickup coil assemblies and proceed to build ing the main circuit This circuit is quite simple in terms of number of components You can assemble it us ing point to point wiring and
160. ouble your income i Computer maintenance service a 10 billion industry 7 Feed a 5 kHz square wave sig nal into input J6 or J7 If you are presently servicing office machines or any other electronic equipment 8 Set the input level VERT GAIN ig pas sasa Q as ulia es M and VERT POSITION to obtain a cen ica ieri gere ed teo Pal compar aiaa bil cu odes Re tered display If you do not have a Tech Serv can put ycu into computar repair quickly economically and efficiently p y pU pane Y signal generator see below Adjust and w WE s a support program including a proven marketing plan trimmer C44 to obtain a square wave 9 Set RANGE to the 1V DIV and RECOGNITION an AN acu a ae ae ba cibos Nationally recognized trademarks and Hands on training IBM Compaq Apple p gnal l vel to obtain logos give you immediate recognition as and compatibles at 3 separate levels a centered display a professional computer repair specialist Level 1 y ida poa inar ae onfi 10 Adjust trimmer C43 to obtain o V Mie iri iin Computer and E gree guration a square wave i FRIAR eee Level 2 iei Wa 4 ira Letter Quality and Laser Printers 11 Set BAROEG EVAN andad We provide manuals schematics documen Level 3 System Networks Configuration just the input to obtain a centered tation and advanced diagnostic software Installation and Repair display NEW HARDWARE FINANCING 12 Adjust trimmer C42
161. ound sound audio enhancer Security telephoned status report er alarm control center Home convenience selectable phone ringer musical tunes touch sensitive light controller and so much more The Fun Projects are capped by intro ductory information on building proj ects and kits tools needed parts sources etc and advanced design techniques that illustrate how adesign er thinks and plans when putting togeth er a practical end product From beginning to end MODERN ELECTRONICS FUN PROJECT BOOKS are for you Order them today for a fast start in the world of electronics Order Date QTY Title First Book 12 95 ea of Modern Electronics Fun Projects Second Book of Modern Electronics Fun Projects 12 95 ea Both Books Order both books ang pay only 22 95 Plus shipping Shipping charges 2 per order Orders processed day received but please ailow 30 days tor delivery January 1991 MODERN ELECTRONICS 55 BI ELECTRONICS NOTEBOOK mmm Experimenting with Crystal Oscillators By Forrest M Mims III Imagine a magical slice of crystal that vi brates at a stable frequency when con nected in a circuit with a transistor and a few resistors and capacitors This magi cal crystal is not a science fiction writer s dream it s one of the oldest solid state electronic components and is commonly known as the quartz crystal resonator Many of the newer electronic instru ment
162. port we will analyze is 74HC165 U2 This simple shift register makes it possible to get data out of the dis play memory and into the display The CPU outputs eight bits of data into the eight bit register inside U2 The data is moved from system RAM throughthe CPU to pins A through H and into a register inside U2 The program then turns on the timer located in the 8155 which gen erates eight pulses that are sent tothe CLOCK input on U2 Toggling the clock shifts data one bit at a time out of the register to pin 9 The same eight clock pulses are used for the DATA CLOCK signal that loads data into the display s 240 bit row regis ter It takes 30 eight bit output oper ations to fill one row of the display 1 920 output operations to fill all 64 rows just once Remember if the dis play is refreshed 50 times per second 96 000 outputs to the U2 shift regis ter are needed every second This is well within the capabilities of the 8085 It is mentioned here to give you a feel of how interesting the design of this product is e 8155 I O Port with Built In Timer The next port we will discuss is the 8155 Thischipis innocent in appear ance but it includes two eight and one six bit ports that can be pro grammed as either inputs or outputs It also has a timer that can be started and stopped that generates a wide va riety of waveforms This chip is a good example of the new generation of devices that have to be initialized with a
163. r Later I ll listen to news broadcasts from around the world on a digitally CRYSTAL Fig 1 Equivalent circuit for a quartz crystal tuned communications receiver whose precision is made possible by a quartz synchronized phase locked loop Finally all of us will conclude our day by setting the alarms on our quartz crystal con trolled clocks Before switching off the light I ll probably punch in the 10 MHz WWV broadcast and reset my watch and clock on a time signal By now it should be apparent that much of what we do is made possible or enhanced by the ubiquitous quartz crys tal And I haven t even mentioned such crystal controlled gadgets as video games CB radios and video cameras In all these applications quartz crys tals are used in oscillator circuits They can also be used as filters that selectively Pass only a desired frequency A more recent development is the use of quartz crystals to detect minute mass changes in thin films of various sub stances deposited on the crystal Placing a coating on a quartz crystal alters its res onant frequency If the coating material attracts certain molecules when they re present then the mass of the coating is in creased This causes a further alteration in the crystal s oscillation frequency Mass changes as small as a billionth of a gram per square centimeter can be de tected in this manner One result is quartz crystal sensors that detect tiny amounts of enzymes
164. rcuitry used in the Watt Watcher 32 MODERN ELECTRONICS January 1991 L1 Twisted pair of Le bell wire Remote pickups Values determined during calibration Inductive pickup meter monitors instant ac power usage so that you can more efficiently manage energy consumption circuitry Inductive pickup coils L and L2 are remotely located from the circuitry in the electrical service box They provide a voltage to transform er T that is directly proportional to the amount of current flowing in each leg of the ac power line supply ing your home Any voltage that appears at the iri put to 77 from L and L2 is stepped up by transformer action and applied to the full wave bridge rectifier cir cuit made up of diodes D through D4 After rectification the pulsating dc from the rectifier circuit is filtered to pure dc by capacitor C7 and passed PARTS LIST C1 10 zF 10 volt electrolytic capacitor D1 thru D4Q 1N914 or similar diode L1 L2 Inductive pickup coil see text M1 50 4A full scale analog panel me ter movement Radio Shack Cat No 270 1751 or similar R1 R2 R3 See text for value S1 3 position non shorting rotary switch T1 12 6 volt power transformer Radio Shack Cat No 273 1365 or similar Misc Suitable enclosure transformer for pickups see text two multiple lug terminal strips control knob for S1 twisted pair bell wire tape cable ties foam rubber machine hardware
165. rites from the author s Dans vast treasury of electronics know how Membership Benefits Big Savings In addition to this introductory offer you keep saving substantially with members prices of up to 509 off the publishers prices Bonus Books Starting immediately you will be eligible for our Bonus Book Pian with savings of up to 80 off publishers prices Club News Bulletins 15 times per year you will receive the Book Club News describ E E 2735P 16 95 ing all the current selections mains alternates extras plus bonus offers and special sales with scores of titles to choose from Automatic Order If you 3205 24 95 ma i want the Main Selection do nothing and it will be sent to you automatically HOME If you prefer another selection or no book at all simply indicate your choice ELEC on the reply form provided You will have at least 10 days to decide As a ERU member you agree to purchase at least 3 books within the next 12 months and may resign at any time thereafter Ironclad No Risk Guarantee If not satisfied with your books return them within 10 days without obligation Exceptional Quality All books are quality publishers editions especially selected by our Editorial Board MONE 191 3312 23 95 2813P 317 95 A shipping handling charge and sales tax will be added to all orders komen Ame SIZAR All books are hardcover untess number If card Is missing use this address t
166. rning your Associate or Bachelor degree through directed home study Grantham College of Engineering awards accredited degrees in electronics and computers An important part of being pre pared to move up is holding the right college degree and the abso lutely necessary part is knowing your field Grantham can help you both ways to learn more and to earn your degree in the process Grantham offers two degree pro grams one with major emphasis in electronics the other with major emphasis in computers Associate and bachelor degrees are awarded in each program and both pro grams are available completely by correspondence No commuting to class Study at your own pace while continuing on your present job Learn from easy to understand lessons with help from your Grantham instruc tors when you need it Write for our free catalog see address below or phone us at toll free 1 800 955 2527 for catalog requests only and ask for our degree catalog Accredited by the Accrediting Commission of the National Home Study Council GRANTHAM College of Engineering Grantham College Road Slidell LA 70460 January 1991 MODERN ELECTRONICS 75 Schematics From Your PC from page 51 which is rigidly fixed for both place ment and font size You can choose one of three font sizes from 8 point to 16 point Wires are placed on the drawing by selecting the wiretype from the draw ing cells and clicking
167. ronic bulletin board and a free issue of CIE s school newspaper The Electron All this knowledge and support will put you on the road to understanding digital electronics microprocessing principles computer systems telecom munications and much much more 50 Bookstore Privileges Patented Learning Method Electronic Bulletin Board 24 Hour Grading Total Merchandise S M Ohio Residents add 7 Sa es Tax California Residents add 6 1 2 Sales Tax Total this order Method of Payment Amount Enclosed 7 Personal Check or Monev Order O Master Card A Visa HOOBOOBEHH BOEO DH HI Card Expiration Date Signature EL i VISA CHARGE BY PHONE was 9 AM to 4 30 PM Eastern Time from Ohio 1 800 523 9109 from all other states 1 800 321 2155 MasterCard I p M M M M S m O LLL O M flat frequency response for all three ranges Input impedance of the FET op amp is in excess of 100 megohms while INPUT Z to the scope is 1 meg ohm in parallel with 20 pF 10 The first AD843 is configured as a noninverting amplifier that includes a VERTICAL GAIN control Gain is va riable from 2 to 10 The second AD843 is configured as an inverting amplifier that is set to provide a gain of 10 CAL control R23 is set to calibrate the input to the dis play scale calibration VERTICAL POSITION control
168. ry Software ng Library Printer Netlist Ease of Control Compatible Use B A D C C D C C A D A B B A A C A A D A B D A B D D D B A A D B A is Excellent B is Good C is Fair D is Poor Options available to expand Includes optional 150 library EE Designer III Visionics Corp 3032 Bunker Hill Ln Suite 201 Santa Clara CA 95054 408 492 1440 HiWIRE Plus Wintek Corp 1801 South St Lafayette IN 47904 317 742 8428 OrCAD STD III OrCAD Systems 3175 N W Aloclek Dr Hillsboro OR 97124 503 690 9881 ProCAD Xtra Interactive CAD Systems 2352 Rambo Ct Santa Clara CA 95054 408 970 0852 Where to Buv Protel Schematic Protel Technology Inc 50 Airport Pkwy San Jose CA 95110 408 437 7771 Schema III Omation 801 Presidential Dr Richardson TX 75081 800 553 9119 SuperCAD Mental Automation Inc 5415 136 Pl SE Bellevue WA 98006 206 641 2141 Tango Schematic Series II Accel Technologies Inc 6825 Flanders Dr San Diego CA 92121 800 433 7801 January 1991 MODERN ELECTRONICS 77 Say You Saw It In Modern Electronics NEW PRODUCTS ee from page 1I Single Board Computer The new Model GSC BE3 BASIC plug in engine from GORDOS Rog ers AK permits distributed control by relieving the host computer of many routine control sequencing and data acquisition operations The programmable miniature single board computer equipped with bat tery backed memory
169. s ovenized crystal oscilla tors are available These modules incor porate a miniature heating element that maintains the crystal at a constant tem perature above the ambient temperature WY s RS a January 1991 MODERN ELECTRONICS 57 Say You Saw It In Modern Electronics ELECTRONICS NOTEBOOK MMS364 58 Miz Fig 5 Schematic of a precision 60 Hz timebase generator circuit The stability provided by this method ranges from 1 to 100 parts per billion This high degree of precision is accom panied by several drawbacks The oscilla tors are more expensive and physically larger than non heated modules They consume considerably more power And they require a warm up time before the Fig 6 Physical details of atypical hybrid crystal oscillator module Fig 7 Details for using a modular oscillator to drive a LED specified tolerance is achieved Neverthe less they re ideally suited for applica tions that require ultra stable signals A typical crystal controlled hybrid os cillator has only three or four pins and is about the size of a 14 pin dual in line inte grated circuit Some are much smaller Some oscillator modules are fairly expen CUN USED sive while others are available for as little as 5 or even less from mail order elec tronic parts dealers The giant Newark Electronics catalog lists more than a doz en Dale hybrid crystal oscillators at prices ranging from 4 97 to 6 20 in s
170. s this month brings some interesting offerings We lead off with John P Steiner s Technician s Handbook of VCR Repair Prentice Hall hard cover 171 pages 35 This handy book combines service information from major VCR and test equipment manufacturers with tech niques for diagnosing problems in faulty VCRs Guidelines from VCR manufac turers are included for confirming that repairs and adjustments will restore a VCR to original factory specifications Typical symptoms of faulty circuitry are included for audio systems VHS record ing and playback circuitry power supply Say You Saw It In Modern Electronics circuitry servo systems microprocessor control circuitry and agc and afc systems to allow you to pinpoint which stage s are likely to be defective Adjustment procedures for each major VCR section are also provided In a related book VCR Troubleshoot ing and Repair Prentice Hall hard cov er 242 pages 37 John D Lenk pro vides a practical system of troubleshoot ing that concentrates on current VCR sys tems This book is concerned primarily with differences between hi fi S VHS VCRs and conventional machines Each chapter covers a single function or fea ture Areas covered include S VHS ba sics troubleshooting and repair of the digital system stereo TV MTS MCS de coder audio barcode timer program ming VCR hi fi digital picture in pic ture VISS VASS program indexing in formation on recommen
171. s Office and Bookshelf The Whole Earth Catalog The New Grolier Electronic Encyclopedia and Software Toolworks World Atlas will easily justi fy investing today in a technology that may not reach fruition until some time in the future if ever The Microsoft Office As major companies go Microsoft has been among the most successful in mar keting applications for the Macintosh Microsoft Word is one of the more pop ular word processors on the Mac and its Excel spreadsheet is the best selling Mac spreadsheet The Microsoft Office CD ROM puts these two popular applications together with two others PowerPoint and Micro soft Mail and then adds a big bonus in the form of Office Resources a potpour ri of fonts clip art numerous utilities from third party vendors The end result is a package that fulfills many of the needs of a business at a very reasonable price The CD ROM has a list price of 895 but at thetimethis is being written is available from several mail order com panies specializing in CD ROMs for less than 700 This is quite a bit less than the four applications it contains sell for Two of the four applications Word and Excel have been extensively re viewed elsewhere and I m not going to discus them except to say that they re ex tremely well dcne programs If you need a spreadsheet and word processor for your Mac you won t be disappointed with either of them PowerPoint the third application include
172. s from theoutput of the circuit as you adjust R7 Try bridging the leads or pins on the crystal with your fin gers to see the effect this has A Gate Oscillator Crystal controlled clocks for sequential ly operated digital circuits are often made from a single inverter or NAND gate as shown in Fig 3 Unlike the Fig 2 UJT cir cuit the Fig 3 circuit oscillates at only the fundamental frequency cf the crystal The precise frequency of oscillation can be slightly altered by means of variable capacitor C2 The output from the Fig 3 circuit is a train of reasonably square pulses If you have an oscilloscope you can easily see the effects on the output puises of com ponent placement and the length of the connecting leads You can also see the ef fect of substituting different values for the resistors and capacitors While I originally used this circuit as a clock generator for a digital circuit it can double as a frequency marker generator like the UJT oscillator circuit shown in Fig 2 Maximum oscillation frequency will be determined by the kind of CMOS chip you use Depending on circuit lay out power supply voltage and specific device used a high speed CMOS chip should oscillate at up 50 MHz or greater A Clock Generator Several available IC circuits are designed specifically to supply clock pulses when connected to a crystal Figure 4 shows how one of these the ICM7209 is used in a practical circuit The ICM7209
173. s shown in the schematic diagram Regardless of the output voltage selected all but two components remain the same Capacitive reactance X of C1 is used to drop the incoming 117 volts ac from the power line to a safe us able level for use in low voltage IC and transistor circuitry Unlike a large dropping resistor the reactance capacitor develops no heat Depend ing on the output voltage required Ime ew rie ee cM GU sir h C1 1 5uF D1 D4 1N4004 117Vac R1 100 V D5 see text OGND Schematic diagram of a simple transformerless ac operated power supply for low power circuit experimenting Zener diode D5 must be selected for voltage output desired for your application you must select a value for C that will provide ade quate voltage dropping action at the 60 Hz ac line frequency The formula for determining the reactance of any capacitor is C 1 2xFC where F is the frequency at which the reactance is to be calcu lated and C is the value of the capaci tor in Farads In the case of the 1 5 microfarad capacitor needed to ob tain an approximately 5 volt output from the power supply the reactance is 1 6 28 x 60 x 0 0000015 or 1 769 ohms at the 60 Hz line frequen cy Thereactance of the 2 2 microfa rad capacitor needed for an approxi mate 12 volt output is 1 206 ohms To do the same job as the capacitor the power supply circuit would re quire a resistor rat
174. s that we ve come to depend on are made possible by quartz crystals In this column I ll list some of these instru ments discuss the operation of quartz crystals and describe some experiments you can perform with them First how ever let s review a few of the many appli cations for this ancient component Applications Most of usaresurrounded by quartz crys tals The timing of the signals moving in and out of the processor inside the laptop computer into which these words are be ing typed is synchronized by a quartz crystal that vibrates at a frequency of 7 16 MHz The accuracy of the digital watch on my wrist is made possible by a tiny quartz crystal that vibrates at a fre quency of 32 768 Hz The accuracy of the computer controlled data logger I use to monitor the sun is made possible by a quartz crystal A quartz crystal controls the tracking rate of the telescope pedestal I use to track the sun across the sky After this column is typed I ll go for a ride on a bicycle equipped with a tiny speedometer controlled by a quartz crys tal This evening my wife will cook part of our supper with a microwave oven whose timer is controlled by a quartz crystal oscillator One of my children will punch quartz crystal controlled tones in to a telephone while placing a call to tell me to come in for supper After supper we ll watch a weather broadcast on a TV receiver whose color is regulated by a 3 58 MHz quartz crystal oscillato
175. sche matic capture programs also have provisions to produce data from schematic drawings to make printed circuit board layouts emulate actual circuit performance and compile Bills of Materials All the programs reviewed here can produce such in formation in the form of netlists These files are generated in ASCII format and are therefore easily edited with a word processor In ad dition schematic capture programs enhance accuracy through automatic Design Rule Checks that might in clude short circuit checks flagging duplicate component designations and more The extra ability to lay out PCBs from netlist files can be produced by PCB layout programs you have or through third party companies Some schematic capture programs also include an integrated PCB de sign program Additionally sche matic capture programs usually have greater component libraries and more sophisticated operating fea tures than plain schematic drawing programs Of special importance to designers is the Bill of Materials BOM netlist these programs pro duce The BOM lists all the compo nents used in the circuit and can be employed to create purchase orders Here we examine eight popular schematic capture programs and evaluate them for performance and features They are EE Designer HiWIRE OrCAD SDT III Pro CAD Protel Schematic Schema 36 MODERN ELECTRONICS January 1991 III Super CAD and Tango Schema tic II Three of them
176. smission system is claimed to deliver bright bold pictures and clear sound CIRCLE NO 4 ON FREE INFORMATION CARD No Contact Voltage Sensor A non contact voltage detector has been announced by A W Sperry The Model VH 601A Volt Sensor is designed to detect 100 to 600 volts ac with respect to ground bv simply grasping the instrument in your hand and placing the tip near a live wire If the wire is indeed live the VH 601A gives both audible and visual indications The 1 4 0z device requires two AA cells for operation CIRCLE NO 5 ON FREE INFORMATION CARD CD Lens Cleaner The Audio Technica Compact Disc player lens cleaner uses an eight brush wet dry system to completely remove dust oil and other contaminants from laser lenses The No AT6078 accessory is said to maintain opti mum laser performance reduce play back errors and eliminate excessive error correction Eight specially positioned brushes mounted on a Compact Disc wash and whisk away contaminates and Which symbol represents a variable inductor What is the princi EM NHNI of neon What are M dme signals Heath Video Courses speed your learning curve Learn basic electronics at home at your own pace with four 60 minute video tapes Know the variable inductor symbol Recognize a PN junction Understand oscillator fundamentals Clearly SEE what most basic electronic books can only describe DC ELECTRONICS Covers electron mov
177. ssified Commercial Rates 1 per word 15 word minimum 15 00 prepaid Word count includes name and address ZIP code and abbreviation each count as one word P O Box number and telephone number count as two words each Indicate free cate gory heading Computers Communications Electronics Video or Miscellaneous A special heading is available for a 6 surcharge First word only is set boldface caps at no charge Add 20 for acditional boldface words Non Commercial Rates FREE to subscribers as space permits maximum 15 words A recent MODERN ELECTRONICS mailing label must accompany ad All advertisers with P O Box addresses must supply permanent address and telephone number Copy is subjeci to publisher approval Mailing Information Copy must be received by the publisher by the 25th of the third month preceding the cover date Send Advertising material with check or money order or credit card information Visa or MasterCard only with number and expiration date to MODERN ELECTRONICS Classified Department 76 N Broadway Hicksville NY 11801 VIDEO T V NOTCH FILTERS SURVEILLANCE EQUIPMENT BROCHURE 1 00 D K VIDEO BOX 63 6025 MARGATE FL 33063 1 305 752 9202 TINY 2 WATT TELEVISION TRANSMIT TER 2 Mile Range Under 100 Complete Plans 12 95 Satisfacticn Guaranteed SU PERCIRCUITS 1403 E Bayview Hermosa Beach CA 90254 213 372 9166 PROJECTION TV Convert your TV to project 7 foot picture
178. st rate schematic capture segment has all the standard bells and whistles plus some For ex ample a Width command allows you to increase the default width of a wire circle text height and more in whatever increments you wish There 46 MODERN ELECTRONICS January 1991 are even two command interpreter shells to choose from a two letter mnemonic and a VMS DCL type Rotation of a symbol features extra power it can be done in 1 degree in crements It also has an adjustable automatic save feature And zoom magnification is unlimited Further more lines can be drawn at any angle desired Rubberbanding snap on grid dragging scaling block moves un do undelete in hierarchical steps macro commands step and repeat automatic ground and voltage con nections autopan mirror X and Y axes find and the like are all part and parcel of this fine program s tools A strong Design Rule Checker DRC checks for opens and shorts although most of its power is re served for PCB work Component designations like U1 U2 R1 R2 etc are automatically applied in sequence If changes are made the program upgrades all Accordingly there is no possibility of duplicate component numbers ProCAD s netlist can generate support for a lot of programs with Futurenet Simulog ECAD PSpice and other interfaces as well as op Say You Saw It In Modern Electronics X C UNGM o
179. t comes through Aiso held over is the wide range of subjects that the Catalog covers from communications to do it yourself Say You Saw It In Modern Electronics veterinary medicine Not everything in this CD will be of interest but you ll be very pleasantly surprised at how much is The Electronic Whole Earth Catalog wouldn t be possible without Hyper Card a software package pioneered by Apple s Bill Atkinson HyperCard uses cards which are screens filled with in formation and allows links between a word on one card and sections of text on another For example if you re perusing a card that talks about magazines and come across the word muiti media you could move the cursor to this word and click the mouse button If links have been established HyperCard will take you to a card that discusses Multi media When you re reading this card you can either branch on to an additional topic or click on the home icon to re turn to the original card A collection of cards makes up a stack which could be equated with a chapter of a standard paper based book The Electronic Whole Earth Catalog is unique in that it s even moreeffective and efficient as a CD ROM based Hyper Card stack than as a paper based publica tion There are even 500 or so sound sam an wa o YU s O 60 Soie corde qne nom Me CIRCLE NO 39 ON FREE INFORMATION CAND ai ELECTRONIC COMPONE
180. t without a complete listing of the BASIC control program it is essen tially useless Could you please supply the complete program Eugene P Schmitt Mequon WI 4995 with this value you would have to change You are correct When we ran out the the value of R4 to 2 500 ohms Ed disk file containing the BASIC control VCR REPAIR PARTS KIT program the right side of those lines that antis ls Gremlins at Work exceeded 66 characters truncated and left kit you can v peg eln reading over my Thermally Ma the printout incomplete Here is the pro do most of chine Project Boxes in the November is gram with all the information in it Ed your VCR ee repairjobs gt o 10 CLEAR CLOSE KEY OFF CLS DEC 0 OUT 888 DEC the same 4 20 BYTES 0 0 0606 0 0 0 oO days V a 30 LOCATE 1 21 PRINT 2DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD 40 LOCATE 2 21 PRINT 3 PARALLEL INTERFACE PROGRAM 3 Co Sed parts for RCA Hitachi 50 LOCATE 3 21 PRINT GDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDY Fisher Sanyo Lloyds Panasonic Sony 60 rui s ean 15 PRINT BIT NUMBER 7 6 5 4 3 2 Sharp JVC and more Over 45 parts in all 70 LOCATE 11 15 PRINT DDDDDDDDDDDDDDEDDDEDDDEDDDEDDDEDDDE DDDEDDD4 All parts are available individually for 80 LOCATE 12 29 PRINT 3 3 3 3 3 3 3 3 w reorder 90 LOCATE 13 29 PRINT A A A A A A A A 8995 100 LOCATE 14 15 PRINT VALUE gt BYTES 110 LOCA
181. tails immediately NAME ADDRESS iia CITY _ STATE ZIP Il au Sane m m gue m mmm NEW LIT ERATURE from page 75 ital techniques microprocessing fiber optics amateur radio operation and more Important prerequisite informa tion and a listing of needed materials for each course are given A variety of Heathkit trainers available assembled and in kit form and accessories used in performing course experiments are noted throughout the Catalog as are optional instruction videocassettes for several of the learning programs Also featured are a variety of educational kits for beginners and experienced kit builders CIRCLE NO 56 ON FREE INFORMATION CARD Full Line Catalog Available for the ask ing from Parts Express is the company s 1990 1991 full line catalog that lists and describes electronic components and ac cessories Included in the listings are ca pacitors resistors switches speakers and accessories connectors cable and wire TV CATV and VCR repair parts chemicals tools technical books and schematic diagrams alarm equipment and computer accessories CIRCLE NO 57 ON FREE INFORMATION CARD Selection amp Use of DMMs Booklet A full color Application Note booklet from John Fluke Mfg Co Inc Everett WA provides DMM buyers with selection cri teria and current DMM users with infor mation to maximize the value of their in struments
182. te as many items as you wish in reverse order Only the library symbol editor has a help screen and that s limited to a succinct summary of Chapter 24 in the User s Manual All netlists are in proprietary Protel Schematic format Printer and plotter hard copies are both of excellent quality Hard copy output is done using an external utili ty that gives you complete control over all aspects of the printer or plot ter including drawing orientation fit drawing to page and page offset to name but a few For pure hard copy drafting quali ty and editing freedom Protel Sche maticis superb However it s lack of support for formats other than Pro tel limits its PCB layout application to Protel products only CIRCLE NO 26 ON FREE INFORMATION CARD Schema III is a 495 schematic cap ture program that s reasonably easy to learn and use but lacks some of the drawing and editing provisions other programs in this price range possess But it has LIM expanded memory provisions and a data com pression program for its libraries Schema s component library con sists of about 1 000 parts divided among nine library modules with heavy emphasis on TTL devices Many of the objects in the library are um P Rc c a Hem ao cm a u Schema III from Omation outlines and headers that let you easi ly piece together custom components using the library editor All nine li brary modules may be activ
183. the 10 MHz clock to the CPU Other outputs se lected via J2 supply timebase signal AD CLOCK to the address generator the A D converter and data RAM You use the signals produced by these circuits to adjust frequency compensation capacitors to obtain a flat frequency response in the analog input attenuator Data RAM Address Generator The address generator Fig 8 is used exclusively to produce addresses for the data RAM In data write mode that is when the A D or logic analyz er is writing data to the data RAM the addresses to data RAM must be generated in synchronization with data being supplied by the A D con verter or logic analyzer Therefore they are indexed or incremented by the AD CLOCK signal When the CPU wants to read the data RAM addresses to the RAM are not supplied by the CPU In stead data RAM is read by the CPU like an I O port The RAM addresses are indexed by the chip select signal generated by the I O decoder signal CS FX See Fig 9 for the timing dia grams The logic analyzer can be very useful when verifying the timing of these kinds of signals The addresses needed are generated by the dual four bit counters inside 74H C393 U29 The address generator is first set to zero by the CLEAR CTR Say You Saw It In Modern Electronics SELECT 5 BOOKS js ne CIRCUITS wmm a VOLUME ONE for only 5495 E WS values to 129 70 sos s and get a FREE Gift sind FIBE
184. there he wrote three columns be fore being cut off concerned physical science experiments and construction projects not biology or philosophy of course It seems that Scientific American s editor feared that he would be embarrassed if other people found out about Forrest s beliefs and tried to exploit the fact that he was writing for the publication Now that s paranoid at best think given the subject matter that Forrest writes about My view about this is in a nutshell what I told a Wali Street Journal reporter who quoted me in its newspaper as follows His personal beliefs have nothing to do with the work he does Supporting my attitude Forrest has indeed been writing for me regularly for more than a dozen years now So have two other ME writers who share his private beliefs Clearly it s simply not a consideration here for ac cepting or rejecting anyone s articles Nor should it beoth erwise elsewhere when the subject being written about has no relation to another topic Would Scientific American have rejected writings from William Shockley co inventor of the transistor and the founder of a company that spawned California s Silicon Valley on solid state technology because his controver sial views on genetics may run counter to what they would like it to be I m confident that this would not be the case Shame on you Scientific American leet uos January 1991 MODERN ELECTRONICS 5 340 E
185. to assembie kit P LEASE ADD inciudes all parts and instructions Only 29 98 tax inci Extra Bold Worcs 20 cents Special Heading 6 eg The WIRELESS TELEPHONE TRANSMITTER model WTT 20 is only about the size of a dime yet transmits both sides of a telephone conversation to any FM radio with crystal ciarity Completely automatic Uses power from the teiephone line itself never needs a battery Up to mile range Tunes from 70mhz 130mhz Easy to assembie kit includes ail parts and instructions On iy 29 98 tax incl Call or send MO VISA MC tor Immediate delivery Single kit orders Include 1 50 S amp H FREE SHIPPING on orders of 2 or more All orders shipped by U S Mail COD edd 4 00 Personal checks allow 21 days DECO INDUSTRIES Print Full Name Signature BOX 607 BEDFORD HILLS NY 10507 914 232 3878 SS aa ae rs tu ZG NN CIRCLE NO 18 ON FREE INFORMATION CARD January 1991 MODERN ELECTRONICS 81 TOTAL PAYMENT ENCLOSED Check or Money Order Payment may also be made by MasterCard or Visa For this please fill in information below Credit Card Number Expire Date Say You Saw It In Mocern Electronics CABLE MATE INC Are You Tired of Paying Outrageous Fees All makes and models of cable equipment shipped within 24 hrs Quantity discounts For free catalog send S A S E to Cable Mate Inc 450 Shag Bark Algonquin IL 60102 C O D orders accepted CALL FOR PRICES TODAY 800 422 0525 mom
186. tor and phase com parator in the 4046 phase locked loop If the input frequency is kHz avail able outputs are 2 kHz through 9 kHz in increments of kHz For higher frequen cies you ll have to alter the values of some of the resistors and capacitors con nected to the 4046 See the data sheet for this chip for details Going Further Many books discuss the details of quartz crystal design and assembly Visit a libra ry if you wish to know more about these technical details For a good review of quartz crystal hy brid oscillators see Signal Sources Handle Tough Timing Jobs by Tom Or mond in EDN Sept 3 1990 pp 93 through 102 This article includes a list of the major manufacturers of hybrid crystal oscillators ME January 1991 MODERN ELECTRONICS 65 Say You Saw It In Modern Electronics WPC CAPERS kIT Compact Disk Technology and Computers By Ted Needleman A technology that s been around for a few years is just finally starting to take off CD ROM As Modern Electronics readers I m sure that just about every one of you is familiar with Compact Disk technology After all it s rapidly sup planting both the pressed vinyl record and tape modes on which music is distributed The process of storing musical infor mation in digital form also makes the technology perfect for use with PCs Af ter all all those ls and Os being read from the disk don t have to be Led Zeppelin or Lawrence Welk Th
187. two multiple lug terminal strips as illus trated in Fig 3 Machine the meter panel as need ed Drill mounting holes for the transformer switch and terminal strips Then cut an appropriate size hole in which to mount the meter movement When you are finished machining the panel deburr all holes to remove sharp edges Then mount the transformer switch meter move ment and terminal strips in their re spective locations Plan your component connections to the lugs of the terminal strip care fully Trim leads to length and crimp them to the appropriate lugs of the terminal strips Make sure when you are done that the diodes and capaci tor are properly polarized Defer in stallation of the resistors until after calibration Referring back to Fig 1 intercon nect the components with hookup wire If you are using stranded hook up wire strip inch of insulation a wO January 1991 MODERN ELECTRONICS 33 from both ends twist together the ex posed fine wires and sparingly tin with solder Then crimp and solder the ends of the wires to the various locations in the circuit Determine where you will locate the Watt Watcher in your home and mount its enclosure where it will be in easy view Then determine how you will route the bell wires that will con nect the main circuit to the remote in ductive pickups The simplest and most direct route is to drop straight down through a hole drilled through the floor and
188. ucts advertised as well as for some editorially mentioned products Simply circle the appropriate number printed below an advertisement onto the ME Free Information Service card bound into this issue After filling in your name and address just mail the postpaid card Your request will be for warded directly to the advertiser with a mailing label prepared by our reader service department Say You Saw It In Modern Electronics rent screen is active Editing features are limited to sin gle objects only Blocks aren t sup ported A help screen isn t included either Among the editing options are copy move delete and find Included is a netlist converter that converts schematics created with many other netlists into HiWIRE format for input to its PCB layout software The schematic capture sec tion can generate either PostScript LaserWriter or AutoCAD DXF out put files for interface with other soft ware programs HiWIRE has virtually no control over the file output to a dot matrix printer which results in an A size drawing using less than one fifth the area of an 8 x 11 inch sheet and only slightly better control over a las er printer Schematics produced by either are of very poor quality and are just barely usable as drafting p a n r s qm proofs If you re dealing with a plot ter however you have absolute con trol over the instrument at all times HiWIR
189. used drawing rou tines suchas creating memory arrays or labeling a worksheet then replay the routine via a single keystroke from the keyboard Macros are cre ated by turning on the macro record er and letting it run while you make your moves Hitting M turns the re corder off and saves the macro to file Over 100 macros can be stored provided their aggregate total doesn t exceed 64K OrCAD STD III has autopan but it doesn t scroll smoothly The screen abruptly jumps to the next area of the drawing indicated by the cursor movement making part and wire alignment difficult on large draw ings Turning on the grid and zoom ing out makes placement easier but you ll have to zoom back in to fill in the details There s also a jump fea ture that lets you tag up to eight spots on the worksheet and jump to a spot by simply calling its name A help screen isn t featured CIRCLE NO 24 ON FREE INFORMATION CARD Loo e OO ProCAD from Interactive CAD Systems ProCAD is in the top rank of inte grated schematic capture programs and includes PCB layout software for use with IBM PC XT AT PS2 and compatibles That is both modules are superior types Moreover it also includes an integrated 2 D graphics editor for limited drawing wants The company offers a few differ ent software versions The one we ex amined is ProCAD Xtra priced at 795 with nine libraries of compo nents plus seven optional libraries for an added 150 Th
190. valuate the results of an experiment In contrast the display of an ordinary analog scope is lost the instant after the event occurs There are tradeoffs naturally A disadvantage of DSO scopes is that bandwidth may be somewhat less than some of the more expensive an alog scopes The DSO to be described is capable of sampling the input 20 million times per second which is more than adequate for experiments we will be conducting Its vertical sensitivity ranges from 10 mV to 5 V per division 50 V per division if a 10 1 probe is used Our DSO s horizontal timebase is adjustable in 21 steps from 1 ys to 5 seconds per division The display used Fig 1 Circuit details of the liquid crystal display section is a standard liquid crystal unit com posed of 64 dots vertically and 240 dots horizontally Accordirgly this resolution results in a display that is not as smooth or as bright as that of an analog scope For example noise looks a bit odd because it produces little steps in the display but this is easy to get used to In the Logic An alyzer mode the display is smooth because signals are either in a high or low state Nevertheless it is satisfac tory for our purposes Most scopes do not include Logic Analyzer inputs We decided to add this feature because the ability to view signals simultaneously is invalu able in learning how digital circuits work Understanding microproces sor timing diagrams becomes simple
191. values to them The tighter the toler ance the more accurate the readings Once installation is done you should educate all the members of your household on electric usage and its cost At 10 cents per kilowatt hour for example the center points of the three ranges represent a per hour cost of 2 5 cents 25 cents and 2 50 ME lights will suffice to develop a Which two i similar hie ae developed for the first IC battled for years over its steer A Bartles amp James In Q B Bob Noyce and Jack Kilby aCe GS C Wilber and Orv j rvill i Quotient Tues Wright If you answered B you re already ahead of the game To stay ahead of fast changing IC product specs and vendor information smart electronic professionals will turn to the ALL NEW 1991 IC MASTER 3 Volumes 3 400 pages Functional guide to 80 000 standard ICs including 12 000 NEW ICs 1 000 manufacturers data pages x Avoilable February 1991 Pre paid orders received Before Jan 31 91 135 Add sales tax in NY MA IL CA After Jan 31 91 160 Send check Hearst Business Communications vise 645 Stewart Ave Garden City NY 11530 Att Marie Botta MS 08 1516 227 1300 FAX 516 227 1901 CIRCLE NO 86 ON FREE INFORMATION CARD Say You Saw It In Modern Electronics with P O to SuperCAD Schematic H Entry Software for the IBM PC amp Compatibles
192. ved the printer fonts with another application or are printing to an Encapsulated PostScript file to be used by a typesetter who has the corres ponding printer fonts and MacFont ware from Bitstream a OL c oo c January 1991 MODERN ELECTRONICS 67 Say You Saw It In Modern Electronics PC CAPERS I ve discussed the PC version of Bit stream s Fontware in previous columns and the Mac version works pretty much the same letting you generate screen fonts and printer fonts both QuickDraw and PostScript from outlines supplied by Bitstream The MacFontware sup plied with the Office ROM includes Bit stream s own Charter typeface and gives you an excellent idea of what the technol ogy can do Other typefaces are available from Bitstream and will work with the MacFontware software Other neat applications included on the CD ROM are phone listings from Xiphias and The Phone Book Library from General Information Xiphias National Directory is a CD ROM based telephone database that includes more than 120 000 listings for American busi ness and government The version in cluded with the Office is a demo rather than theentire database but is interesting nevertheless General Information s Phone Book Library is a HyperCard application that lets you set up your own phone books or access the National Directory 5000 an in cluded database of more than 5000 busi ness listings I ve had General Infor mation s H

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