Ramsey UT5 User's Manual
Contents
1. VOLUIVE 2K IIK 2 GENERAL PURPOSE TEST OSCILLATOR 200 to 20 000 Hz QO Same as above plus QO Add switches and capacitors as desired for maximum range and conveniences 3 PRACTICE METRONOME Q Same as No 1 but try C1 at 47 uf If desired add an LED and 1K resistor in series across the speaker capacitor 4 TICK TOCK SOUND PULSE GENERATOR Same as above but try values like 100 220 330 uf for C1 5 PET amp PEST COMMUNICATOR Extremely high pitched sounds have varying effects on both pets and pest animals Values like 001 uf for C1 using the same circuits above with a high frequency response speaker will put you into that world of experimentation They say that some insects also stay clear of ultra high pitched sounds UTS 13 SAMPLE PROJECT MONOSTABLE MODE In this era of digital clocks commercially available timing gadgets can be either amazingly cheap or oppressively costly In general we build timers ourselves instead of buying them only if a reasonably priced commercial device just will not do the job that we want done Most timers that are accurate to the millisecond do not have the ability to switch an external device Most applications for custom designed timers are one of a kind requirements One such application comes to mind even as write this The computer driven phototypesetter used for these books requires that the paper be advanced for 6 5 seconds after each run before cutting and proce2. The UT5 is assembled and completed in three phases Phase 1 Soldering 555 IC and parts common to all circuits Phase 2 Planning and installing Timing and Mode components Phase 3 Planning and installing specific project connections The installation of the parts on the PC board does not take long and is not difficult However proper soldering and correct selection of components is as important for this simple circuit as it is for our most complex kits First check your parts against the Kit Parts List on the following page UTS 3 UT5 PARTS SUPPLIED WITH KIT PARTS COMMON TO ALL CIRCUIT APPLICATIONS 2 01 uf disc capacitor marked 01 or 103 or 10nf C2 C3 2 1Kohm resistor brown black red R4 R5 2 10K ohm resistor brown black orange R1 R2 1 100K to 250K ohm potentiometer R3 style may vary 1 NPN transistor Q1 2N3904 or equivalent 1 NE555 IC U1 or equivalent such as MC1455 PARTS SUPPLIED FOR BASIC APPLICATIONS 1 1 uf electrolytic capacitor C1 A 1 33 uf electrolytic capacitor C1 B 1 01 uf disc capacitor marked 01 or 103 or 10nf C1 C 1 1K ohm resistor brown black red R6 for astable mode REQUIRED NOT SUPPLIED 5 15 volt DC power supply switching or keying controls output device relay speaker LED transistor switch etc gt OOOO OOOOW OOOOOD UTS 4 UT5 PARTS LAYOUT Phase 1 BASIC PC BOARD ASSEMBLY m Oooo m m Q m 1 Install 10K re
3. be found by formula also worked easily as a Basic computer program Frequency Hz 1 44 R3 R4 X C1 in farads Either section of the program may be re organized as you like rendered in scientific notation or otherwise improved 410 PRINT FIND FOR FREQUENCY F MICROFARADS C OR OHMS R 420 INPUT ENTER SELECTION Y 430 IF Y F THEN 460 440 IF Y C THEN 510 450 IF Y R THEN 560 470 INPUT R3 in ohms R 480 PRINT FREQUENCY in Hz gt 1 44 R 2000 C 000001 490 PRINT UTS 11 500 GOTO 410 510 INPUT Desired FREQUENCY in Hz gt F 520 INPUT R3 in OHMS R 530 PRINT Required capacitance in uf 1 44 R 2000 F 000001 540 PRINT 550 GO TO 410 560 INPUT Desired FREQUENCY in Hz F 570 INPUT Value of C1 in microfarads C 580 PRINT Required value of R3 in ohms 1 44 C 000001 F 2000 590 PRINT 600 GOTO 410 610 REM 2000 IS 2 4 AND SHOULD BE ADJUSTED IF R4 IS CHANGED SAMPLE PROJECTS OSCILLATOR MODE These project ideas are models or samples Once you understand the full capabilities of the UT5 you can adjust these details and add all the bells and whistles you wish 1 CODE PRACTICE OSCILLATOR Basic Model for ALL 555 Audio Tone Generator projects QO Use R6 for Jumper 1 Install Jumper 2 C1 22 or 33 uf R3 pitch control 100K pot Connect key in series with DC line Oooo UTS 12 Connect speaker amp volume control as shown
4. reasonable quality Also resistors are available in very precise tolerances if necessary UTS 9 Consequently it is wise to consult an electronics parts catalog or store for available capacitor values and do your circuit designing around values that actually exist whether a single capacitor or a capacitance created by series or parallel combinations PLANNING THE TIMING BY FORMULA The timing can be calculated exactly by this formula TIME in seconds 1 1 C1 in farads X R3 in ohms and may also be expressed and worked in these ways TIME 1 1 X C1 in uf X 000001 X R3 in ohms TIME 1 1 X C1 in uf X 10 6 X R3 in ohms Run the following BASIC routine on any computer to explore R3 and C1 combinations quickly and easily 10 PRINT FIND FOR TIME T MICROFARADS C OR OHMS R 20 INPUT ENTER SELECTION X 30 IF X T THEN 100 40 IF X C THEN 200 50 IF X R THEN 300 100 INPUT C1 in microfarads C 110 INPUT R3 in ohms R 120 PRINT TIME seconds 1 1 C 000001 R 130 PRINT 140 GOTO 10 200 INPUT Desired TIME in seconds T UTS 10 210 INPUT R3 in OHMS R 220 PRINT Required capacitance in ufd T 1 1 000001 C 230 PRINT 240 GOTO 10 300 INPUT Desired TIME in seconds T 310 INPUT Value of C1 in microfarads C 320 PRINT Required value of R3 in ohms T 1 1 000001 C 330 PRINT 340 GOTO 10 Similarly the oscillator frequency in astable mode can
5. Please send only the defective part s not the entire kit 2 MISSING PARTS Before assuming a part value is incorrect check the parts listing carefully to see if it is a critical value such as a specific coil or IC or whether a RANGE of values is suitable such as 100 to 500 uF Often times common sense will solve a mysterious missing part problem If you re missing five 10K ohm resistors and received five extra 1K resistors you can pretty much be assured that the 1K ohm resistors are actually the missing 10 K parts If you believe we packed an incorrect part or omitted a part please write or call us with information on the part you need and proof of kit purchase 3 FACTORY REPAIR OF ASSEMBLED KITS To qualify for Ramsey Electronics factory repair kits MUST 1 NOT be assembled with acid core solder or flux 2 NOT be modified in any manner 3 BE returned in fully assembled form not partially assembled 4 BE accompanied by the proper repair fee No repair will be undertaken until we have received the MINIMUM repair fee 1 2 hour labor of 18 00 or authorization to charge it to your credit card account 5 INCLUDE a description of the problem and legible return address DO NOT send a separate letter include all correspondence with the unit Please do not include your own hardware such as non Ramsey cabinets knobs cables external battery packs and the like Ramsey Electronics Inc reserves the right to refuse repair on ANY item in whic
6. SION There s no easier way to create customized timer or oscillator projects than knowledgeable using of the UT5 This very convenient module will make short work of many of those little projects that all of us have always wanted to do Thanks very much for your interest in Ramsey Electronics Kits If you enjoyed this kit and used it to solve a sticky problem there are a lot more versatile and fun kits listed in our catalog write or call for yours today UTS 16 The Ramsey Kit Warranty Please read carefully BEFORE calling or writing in about your kit Most problems can be solved without contacting the factory All Ramsey kits will work if assembled properly The very fact that your kit includes this new manual is your assurance that a team of knowledgeable people have field tested several copies of this kit straight from the Ramsey Inventory If you need help please read through your manual carefully all information required to properly build and test your kit is contained within the pages 1 DEFECTIVE PARTS It s always easy to blame a part for a problem in your kit Before you conclude that a part may be bad thoroughly check your work All our kit parts carry the Ramsey Electronics Warranty that they are free from defects for a full ninety 90 days from the date of purchase Defective parts will be replaced promptly at our expense If you suspect any part to be defective please mail it to our factory for testing and replacement
7. e Easy choice of Timer or Oscillator operation e Makes ideal code practice U N IVE RSAL oscillator e Timer can be triggered by TI M E R positive or negative pulses panaan OSCILLATOR to 100 mA loads Solve all your timing needs easily and inexpensively Timing from microseconds to hours oscillation from sub audible to 100 KHz Easy to use and apply kit features the popular 555 IC Timer chip with fully detailed instruction manual and hook ups ramsey Kit No UT5 INTRODUCTION The purpose of the UT5 kit is to make the popular and versatile NE555 timer IC as convenient and understandable to use as possible Hundreds of 555 circuit ideas are around but they all have one common need a well organized circuit board for taking advantage of this economical IC s capabilities In addition because of the many practical applications of the 555 IC the UT5 Kit has proven to be an exceptionally good educational resource for class and club projects as well as self paced learning in electronics For this reason this manual is prepared with beginners and students in mind Learners will appreciate the UT5 kit s combination of informative manual useful printed circuit board and basic components for a small price Experienced 555 IC users will welcome the practical and truly universal setup of the PC board and might even review the useful 555 IC ideas offered in this booklet THE UT5 PC BOARD If you are going to put the 555 IC to wor
8. h we find excessive problems or damage due to construction methods To assist customers in such situations Ramsey Electronics Inc reserves the right to solve their needs on a case by case basis The repair is 36 00 per hour regardless of the cost of the kit Please understand that our technicians are not volunteers and that set up testing diagnosis repair and repacking and paperwork can take nearly an hour of paid employee time on even a simple kit Of course if we find that a part was defective in manufacture there will be no charge to repair your kit But please realize that our technicians know the difference between a defective part and parts burned out or damaged through improper use or assembly 4 REFUNDS You are given ten 10 days to examine our products If you are not satisfied you may return your unassembled kit with all the parts and instructions and proof of purchase to the factory for a full refund The return package should be packed securely Insurance is recommended Please do not cause needless delays read all information carefully UTS 17 Yo REQUIRED TOOLS ramsey e Soldering Iron Ramsey WLC100 RAMSEY TRANSMITTER KITS i i e FM10A FM Stereo Transmitter TOTAL SOLDER SOLDER o a ee e TV6 Television Transmitter POINTS s eedle Nose Pliers amsey or RAMSEY RECEIVER KITS 39 RTS05 e FR1 FM Broadcast Receiver ESTIMATED e Small Diagonal Cutters Ramsey RTS04 e AR1 Aircraft Band Receiver ASSEMBLY TIME lt OR gt Techn
9. ician s Tool Kit TK405 moh Shortwave Receiver Beginner 1 75 hrs Ar Active Antenna Intermediate 1 0 hr ADDITIONAL SUGGESTED ITEMS e SC1 Shortwave Converter ntermediate 1 s i ee Ne IEN EE RAMSEY HOBBY KITS Advanced 0 75 hrs e Holder for PC Board Parts Ramsey HH3 foe Personal Speed Radar e Desoldering Braid Ramsey RTS08 e SS70A Speech Scrambler o e SP1 Speakerphone e Digital Multimeter Ramsey M133 e MD3 Microwave Motion Detector e PH14 Peak Hold Meter e TG1 DTMF Tone Grabber RAMSEY AMATEUR RADIO KITS e DDF1 Doppler Direction Finder e HR Series HF All Mode Receivers e QRP Series HF CW Transmitters e CW7 CW Keyer e CPO3 Code Practice Oscillator e QRP Power Amplifiers RAMSEY MINI KITS Many other kits are available for hobby school Scouts and just plain FUN New kits are always under development Write or call for our free Ramsey catalog Published by Ramsey Electronics Inc Copyright 1994 All rights reserved Ramsey Electronics Inc i 590 Fishers Station Drive Victor NY 14564 Call or write for our Phone 585 924 4560 Fax 585 924 4555 www ramseykits com full line catalog
10. ire etc to install the input and output wires that you will need for your application m m u Q m m Terminal A OUTPUT used in all applications Terminal B RESET see text Terminal C POSITIVE PULSE see text Terminal D NEGATIVE PULSE see text Terminal E GROUND used in all applications install TWO wires here a black wire for negative DC power and an additional wire for connection to the output device Terminal F 5 to 15 VOLTS DC SUPPLY used in all applications red hookup wire suggested TESTING The kind of test you run depends on your application The output device for the timer mode can be as simple as hooking up your VOM or a small bulb or LED between terminals A and E A speaker is the usual output device for oscillator mode see Application drawings When using the timer configuration a negative or positive pulse may be used to trigger the timer The positive pulse should be at least 1 volt and the negative pulse should be at least 1 2 the DC supply voltage The output point A can sink or source current up to 100 mA maximum Timing for either mode is changed by adjusting the values of either R3 or R4 or C1 UTS 8 UNDERSTANDING THE PULSE INPUTS In this instance a pulse is a millisecond application of either a positive or negative voltage from a digital output device or just the simple punching of a momentary button switch The choice of positive or negative pulse inputs is provided f
11. k you need something economical upon which to solder it and to connect up its many talents to the outside world Even if you work out a 555 IC circuit on an experimental breadboard a permanent application requires some kind of final physical installation Your alternative to this UT5 kit is to buy or make a PC board perf board or some other ingenious and practical connections to the 8 pins of the tiny 555 If you value your time we know you ll appreciate the versatile organization of the UT 5 PC board The versatility of the UT5 PC board is provided by e the in out connections A B C D E and F e mode configuration connections J1 and J2 e easy access timing capacitor C1 location e solder points for various styles of potentiometers R3 UTS 2 THE 555 IC ITSELF The 555 timer chip as it s popularly known among electronics hobbyists packs over 40 parts including 23 transistors into its 8 pin package It may be operated in either of two modes and the UT5 PC board is designed to permit easy set up of either mode Mono Stable one shot Mode In this mode the 555 awaits a command pulse to start a timing cycle which may be any length you choose from miiliseconds to hours depending on the value calculated for C1 and the setting of R3 Astable Mode This mode is most easily understood as Oscillator Mode which includes pulse generation logic clocks LED flashing as well as audio tone generation KIT ASSEMBLY PROCEDURE
12. or your convenience If you want to start the timing with a push button or microswitch simply connect the switch to points C and D THE RESET LINE Once triggered the monostable timer IC will continue its timing cycle even if it s triggered again To RESET the timer in the middle of an unwanted timing cycle apply a negative pulse to the reset terminal B When the reset function is not needed it should be connected to F to prevent false triggering A NOTE ON R3 AND R4 In both monostable and astable modes all timing is controlled by C1 and the combination of R4 fixed and R3 variable or fixed A simple starter potentiometer is supplied with your kit for R3 You can install any value or style of trimmer or panel mount pot that suits your application Don t hesitate to exchange R4 to a value that puts you more in the ball park than may be possible with the R3 pot that you are using For example if your application calls for the timing resistance to be around 500K you can either use a 500K or 1 meg control for R3 OR you can replace R4 with a value such as 470K STANDARD CAPACITOR VALUES It s fine to calculate an exact capacitance in theory but we have to work with fixed value capacitors which are actually manufactured Also remember that capacitors are manufactured to tolerances that may seem quite broad for a precision timing calculation For both reasons R3 is adjustable and its exact value can be checked on a multimeter of a
13. r 1 only ASTABLE MODE R6 as J1 and J2 both installed Q 13 After studying the application ideas in this booklet install your choice for C1 If you use an electrolytic capacitor observe correct polarity If you use a disc capacitor such as a 1 uf for high oscillator frequencies there is no concern about polarity UT5 AND 555 IC THEORY OF OPERATION In the Monostable Mode a negative input at terminal D causes pin 2 of the 555 to pull low momentarily A positive input pulse at terminal C causes transistor Q1 to turn on pulling pin 2 of the 555 towards ground Capacitor C1 is normally held discharged by a transistor within the IC when pin 2 is pulled low a flip flop inside the 555 is set This releases the short across C1 and also sets the output pin 3 high C1 will now begin charging through R3 and R4 When the voltage across C1 reaches 2 3 of the supply voltage the comparator resets the flip flop causing the pin 3 output to go low and also turning on the transistor which shorts C1 In the Astable oscillator Mode the trigger pin 2 and the threshold pin 6 are tied together and the internal discharge transistor pin 7 is tied to the trigger through the timing resistor In this mode the circuit will repeatedly trigger itself as C1 discharges through R6 and charges through R6 R4 and R3 Timing is completely independent of the supply voltage used UTS 7 Phase 3 PUTTING THE UT5 TO WORK Now use some hookup wire speaker w
14. sistor R1 brown black orange 2 Install 10K resistor R2 brown black orange 3 Install 1K resistor R4 brown black red 4 Install 1K resistor R5 brown black red 5 The 555 IC may be soldered directly to the PC board without worry but you may use a 8 pin DIP socket your own if you prefer Use the same care in soldering such a socket and inserting the IC as you would in direct soldering of the chip Note that one end of the IC is marked by a dot notch or band this end MUST be oriented as shown on the PC board layout 6 Install the 555 IC 7 Install C2 01 uf marked 01 or 103 or 10nf 8 Install NPN transistor Q1 with the flat side facing the nearest edge of the PC board connection points C D and E 9 Install C3 01 uf marked 01 or 103 or 10nf This completes installation of all parts that remain constant for all UT5 applications although R4 could be changed to accommodate certain timing needs without replacing R3 Phase 2 PLANNING TIMING AND MODE m m 10 R3 may be the trimmer pot supplied or any potentiometer of your own choice This control may be soldered directly to the PC board or to wires permitting panel mounting etc 11 After considering your intended application install R3 UTS 6 Q 12 Now choose monostable timer mode or astable oscillator for your first project or test Simply install a jumper wire and or R6 1K brown black red as follows MONOSTABLE MODE install Jumpe
15. ssing For the past 5 years I ve faithfully held that paper advance button while watching the clock Hmmm Now know exactly what I ll do with one of the sample UT5s built up while writing this booklet Perhaps the best example of a frequently needed timer that seems to get more expensive as the years go by is the photographic darkroom exposure timer Adding a selector switch trimmer pots alternate timing capacitor s if needed and a relay to the UT5 can give you a very serviceable exposure timer at a fraction of the cost of today s typical digital models or the classic Graylab Timer The switch es can have as few or as many positions as your practical application requires For jobs that are GEFGW good enough for gov t work a single potentiometer with a dial manually calibrated in seconds may serve routine black and white print making needs perfectly well UTS 14 RELAY coil under 100mA SECONDS THE ULTIMATE UT5 PROJECT The 555 IC is so useful and the UT5 PC board connection and jumper points are so convenient that you might like to design your own universal 555 test box with monostable astable switching choice of internal or external DC supply choice of panel button or external positive negative pulses choice of built in soeaker or external output device etc etc Such a gizmo could clean up a lot of workbench clutter save breadboarding time and put a lot of odd connectors and switches to use UTS 15 CONCLU
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