ADSR/VCA Builder`s Guide
Contents
1. 0 1 jumpers For fitting to A D and S R headers Molex MTA 0 1 housing 2 way LED optional connecting technique for the LED 5mm green LED lens LED 5mm LED lens securing ring LED if lens is not self securing Switchcraft 112APC 1 4 sockets Four off mounted either on the Sock4 board or on panel Four knobs Around 2m of insulated multistrand hook up wire Additional components required if using optional Sock4 board Molex MTA 0 1 header 8 way T O Molex MTA 0 1 housing 8 way 1 0 112APC Switchcraft 1 4 socket SK1 SK2 SK3 SK4 A single wire link is to be fitted to L1 on the Sock4 PCB If using Molex KK you ll also need at least 16 crimp terminals Suitable lengths of wire to make up the single 100mm interconnect and two cable ties Using Molex KK 0 1 housings and crimps makes connecting to the LED very simple The LED clip used here is a 5mm low profile clear type with a white plastic securing ring The actual LED is a green LED in a water clear package This is an issue 4 board the earlier issue 3 boards require the cathode connection to be taken back to the power supply header see later for more details Other Notes For those who have fitted the A D and S R 0 1 headers but are not intending to upgrade to the full VC ADSR module set immediately you will need to use those little jumpers These fit across each pair of pins on the headers that is pinl 2 and pin3 4 Four sets of jumpers fitted to tw2. switch that connect to the two pads of RNG 15 Testing testing 1 2 3 Set the mode switch to NORM and the range switch to FAST Connect 15V to the unit making sure you are applying the power correctly Make sure that the LED is not lit If it s on switch off and check all the parts again thoroughly If your LED is off and there is no smoke rising from the board yikes you should quickly run your finger over all the ICs Hopefully none of them are getting too warm to touch If they are there is a problem Click the switch in LOOP and the set the sustain pot to its minimum value You may see the LED start to flash Altering the attack value should change the rate at which the LED ramps to full brightness Altering the decay will affect the time it takes to subside At fast attack and decay times the LED will simply flicker indicating that the ADSR outputs are now moving very fast indeed Change the range to SLOW and the LED should pulse at a slower rate Very slow speeds should be obtainable at the slower settings of attack and decay Make sure the looping stops if you turn up the sustain past about 10 of full scale If nothing has happened so far do make sure you have the jumpers on or wire links fitted to the A D and S R headers Flip the mode switch back to NORM and use a gate signal from a midi CV convertor or an LFO s square wave output Turn all the pots to their minimum value The LED should briefly blip on for every l
3. third one down which is the fourth position of the header OD S624 S 0 kOBZY lac tra f 2 oy rT Issue 3 The black wire is the cathode connection and carries the ground connection to the LED Notice I have used a Molex KK 0 1 header to neatly attach the connections to the LED If you have fitted the PWR header then you should connect the LED s cathode to the wire link that joins pins 2 and 3 of PSU together b Issue 4 Boards Only Wiring the LED is straightforward Simply connect the LED to the pads directly below where the LED is mounted onto the front panel The anode of the LED goes to the square pad and the cathode goes to the round pin 14 Wiring the switches The new panel design features two switches Both are wired in slightly different fashions The mode switch on off on is wired with three pieces of straight solid core wire as shown in the picture below The solid core wire is looped around each switch lug and soldered in place The switch needs to be in its place and tightened before soldering the leads The range switch is wired with a twisted wire pair This simply made by twisting two pieces of insulated multistrand wire together to form a simple cable You can use two different colours but you don t have to It does not matter which wire connects to which lug on the switch All the range switch does is short out the connections when set to SLOW It is the top two lugs of the
4. Oakley Sound Systems SU Oakley Modular Series ADSR VCA Looping Envelope Generator PCB Issues 3 and 4 Builder s Guide V4 0 04 Tony Allgood B Eng Oakley Sound Systems CARLISLE United Kingdom ATTACK amp im OAKLEY ADSR VCA The updated 1U wide front panel in our traditional MOTM compatible format Introduction This is the Project Builder s Guide for the issues 3 and 4 of the ADSR VCA 5U module from Oakley Sound This document contains a basic introduction to the board a full parts list for the components needed to populate the boards and a list of the various interconnections Issue 3 and issue 4 PCBs are identical in everything but a slight change in tracking Issue 4 boards improve grounding layout and allow the LED to be wired direct to its pad without any increased control voltage bleedthrough The LED when fitted to an issue 3 board should be wired as detailed in the relevant section of this Builder s Guide For the User Manual which contains an overview of the operation of the unit and all the calibration procedures please visit the main project webpage at http www oakleysound com adsr htm For general information regarding where to get parts and suggested part numbers please see our useful Parts Guide at the project webpage or http www oakleysound com parts pdf For general information on how to build our modules including circuit board population mounting front panel components and making
5. TE BUSS GATE_IN Pad name PANEL GND ADSR NC CV_IN CV_NC ADSR_ADSR GATE BUSS GATE_IN This older style panel fitted to an issue 3 PCB has used hand wired sockets Socket Connection Connect to all sockets Connect to VCA OUT No connection Connect to VCA IN Connect to VCA IN Connect to ADSR Connect to GATE Connect to GATE Socket Connection Connect to all sockets Connect to OUT No connection Connect to IN Connect to IN Connect to OUT Connect to GATE Connect to GATE 13 Lug Type Earth lugs Signal lug Signal lug NC lug Signal lug NC lug Signal lug Lug Type Earth lugs Signal lug Signal lug NC lug Signal lug NC lug Signal lug Wiring the LED a Issue 3 Boards Only This should have been straightforward but on building the prototype I noticed that performance could be improved by wiring the LED slightly differently than intended If you wire the LED to the pads marked LED then the considerable current taken by the LED produces a small perturbation on the output of the VCA Since we should strive for the best I think it is wise to connect your LED as I have now done Wire the anode of your LED to pin 1 of the pad labelled LED Pin 1 is the square pad However wire the cathode of the LED all the way back to the ground pads of the spare power supply header on the board If you have used the MOTM Oakley header PSU you can wire the cathode back to pin 3 of the dotcom PWR header Pin 3 is the
6. ally pin 5 and so on Power Location number Schematic Pin number 15V Missing Pin 5V Module GND 15V Not connected 1 NnB WN nA BR WN 5V is not used on this module so location 3 pin 2 is not actually connected to anything on the PCB If fitting the PWR header you will also need to link out pins 2 and 3 of PSU This connects the panel ground with the module ground Simply solder a solid wire hoop made from a resistor lead clipping to join the middle two pads of PSU together 10 Building the ADSR module using the Sock4 board This is the simplest way of connecting all the sockets to the main board The Sock4 board should be populated in the way described in our construction guide found on the project webpage There is only one eight way header and it is to be fitted to the bottom side of the board Don t forget to solder in the wire link L1 Link L2 is left open You need to make up only one eight way interconnect It should be made so that it is 100mm long The Sock 4 is really designed to go with our new panel layout However if you wish to use it with our older layout then your interconnect needs to be wired slightly differently You need to ensure that pins 2 and 6 are swapped That is pin 2 on the main board side needs to go to pin 6 on the socket board and pin 6 on the main board side needs to go to pin 2 on the socket board The prototype unit showing the detail of the board to board interconnect Here I
7. good at my contact e mail address found on the website I can service either fully populated PCBs or whole modules You will be charged for all postage costs any parts used and my time at 25GBP per hour Most faults can be found and fixed within one hour and I normally return modules within a week The minimum charge is 25GBP plus return postage costs If you have a comment about this builder s guide or have a found a mistake in it then please do let me know But please do not contact me or Paul Darlow directly with questions about sourcing components or general fault finding Honestly we would love to help but we do not have the time to help everyone individually by e mail Last but not least can I say a big thank you to all of you who helped and inspired me Thanks especially to all those nice people on the Synth diy and Analogue Heaven mailing lists and those at Muffwiggler com Tony Allgood at Oakley Sound Cumbria UK November 2010 No part of this document may be copied by whatever means without my permission 17
8. have used the Molex KK 0 1 system to connect the Sock4 to the main PCB 11 Hand wiring the sockets If you have bought Switchcraft 112A sockets you will see that they have three connections One is the earth or ground tag One is the signal tag which will be connected to the tip of the jack plug when it is inserted The third tag is the normalised tag or NC normally closed tag The NC tag is internally connected to the signal tag when a jack is not connected This connection is automatically broken when you insert a jack Once fitted to the front panel the ground tags of each socket can be all connected together with solid wire I use 0 91mm diameter tinned copper wire for this job It is nice and stiff so retains its shape A single piece of insulated wire can then be used to connect those connected earth tags to pin 1 of I O Pin 1 is the square solder pad A close up of the solid core wire frame that joins the earth lugs together A single wire lower left goes back to pin 1 on the I O header on the PCB I have used Switchcraft 112APC sockets 12 All the other connections are connected to the signal or NC lugs of the sockets The tables below show the connections you need to make New front panel layout Pin Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Old front panel layout Pin Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pad name PANEL GND ADSR NC CV_IN CV_NC ADSR_ADSR GA
9. ng holes for M3 bolts one near each corner These are not required if you are using the three 16mm pot brackets The board size is 143mm high x 87mm deep Note that although the module is called ADSR VCA the PCB used in this project is the VC ADSR board This is because the design features an internal voltage controlled core In conjunction with our Upgrade board the VC ADSR board can be made into a double width module called the VC ADSR The board has been laid out to accept connection to our Sock4 socket board This small board speeds up the wiring of the four sockets and reduces the chances of mistakes Issue 3 and 4 ADSR VCA Parts List For general information regarding where to get parts and suggested part numbers please see our useful Parts Guide at the project webpage or http www oakleysound com parts pdf The components are grouped into values the order of the component names is of no particular consequence A quick note on European part descriptions R is shorthand for ohm K is shorthand for kilo ohm R is shorthand for ohm So 22R is 22 ohm 1K5 is 1 500 ohms or 1 5 kilohms For capacitors luF one microfarad 1000nF one thousand nanofarad To prevent loss of the small as the decimal point a convention of inserting the unit in its place is used eg 4R7 is a 4 7 ohm 4K7 is a 4700 ohm resistor 6n8 is a 6 8 nF capacitor This board may also be used with our older simpler front panel design However there a
10. ng wires Options depending on front panel design 1 New panel design with two switches If building this version then also fit the following parts 1N4148 silicon signal diode D8 D9 2 Old panel design This included the inverted shaped ADSR output but did not have the looping facility or range switch If you are building this then do not fit D8 nor D9 Integrated Circuit Semiconductors LM13700 dual OTA U7 4001 Quad NOR gate Ul 4052 DP4T analogue switch U2 THAT2180LC audio VCA U8 TL072 dual FET op amp U4 U5 U6 TL074 quad FET op amp U3 IC sockets can also be used You need two 16 pin DIL sockets two 14 pin DIL sockets and three 8 pin DIL sockets Pots All pots 16mm Alpha or equivalent 47K or 50K linear ATTACK DECAY RELEASE 10K linear SUSTAIN Alpha pot brackets 3 off Trimmers 100K 6mm horizontal OFF 20K 6mm horizontal GAIN Switches for new panel design only SPDT on on RNG to be connected via twisted pair SPDT on off on MODE to be connected with single core wire Miscellaneous Leaded axial ferrite beads L1 L2 MTA156 4 way header PSU Oakley MOTM power supply MTA100 6 way header PWR Synthesizers com power supply Molex MTA 0 1 header 3 way BUSS for connecting to the Oakley Buss Molex MTA 0 1 header 8 way I O for connecting to sockets Molex MTA 0 1 housing 8 way 1 O for connecting to sockets Molex MTA 0 1 header 4 way A D S R to make the VC ADSR option
11. o Molex KK headers This module can now be either expanded to make the VC ADSR module set or simply left like this for ordinary ADSR usage If you are not intending to ever upgrade your module then before you can use the module you must short out the headers With four small pieces of uninsulated wire resistor clippings are fine you will need to short out the four pairs of pins on both headers Each header must have the following pins shorted together pins 1 and 2 and then pins 3 and 4 Pin 1 is depicted by the square pin Connections Power connections MOTM and Oakley The PSU power socket is 0 156 Molex MTA 4 way header Friction lock types are recommended This system is compatible with MOTM systems Power Pin number 15V 1 Module GND 2 Earth PAN 3 15V 4 Pin 1 on the I O header has been provided to allow the ground tags of the jack sockets to be connected to the powers supply ground without using the module s OV supply Earth loops cannot occur through patch leads this way although screening is maintained Of course this can only work if all your modules follow this principle Power connections Synthesizers com The PWR power socket is to be fitted if you are using the module with a Synthesizers com system In this case you should not fit the PSU header The PWR header is a six way 0 1 MTA but with the pin that is in location 2 removed In this way location 3 is actually pin 2 on my schematic location 4 is actu
12. ow to high gate transition Increase the decay pot and hopefully the LED blips will get brighter and last longer Now increase the sustain pot This should increase the LED brightness and it should stay on for longer It should now stay on for the time the gate is high Increase the attack time you should notice the LED ramping up to full brightness Now connect an audio signal of some sort any will do but a simple triangle wave is quite sufficient You should connect it to the VCA IN socket Connect the VCA OUT to an input channel on your mixing desk or other audio input Hopefully you should find that when the ADSR is gated the audio is heard Play with the A D S and R pots to make sure they do the usual things If you are not familiar with their action I suggest you read the section at the front of the User Manual Make sure that the ADSR socket also produces an output This output is not shaped by the VCA IN signal and should be a standard envelope generator output of 0 to 5V You can test it by routing it to a VCF or VCO 16 Final Comments If you have any problems with the module an excellent source of support is the Oakley Sound Forum at Muffwiggler com Paul Darlow and I are on this group as well as many other users and builders of Oakley modules If you can t get your project to work then Oakley Sound Systems are able to offer a get you working service If you wish to take up this service please e mail me Tony All
13. re small differences to the board components used for each option Resistors Resistors 1 4W 5 or better 100R R47 R37 820R R10 IK R49 2K2 R40 R42 R2 4K7 R14 R53 R54 5K1 R51 R59 R3 10K R8 R50 R16 R19 R11 R38 R20 R17 12K R5 R44 R56 R45 R46 R6 22K R41 33K R29 36K R35 47K R57 R13 R31 R21 R22 R26 R9 R4 R7 62K R30 100K R28 R32 R39 R12 R1 R58 R33 R55 390K R23 R24 1M R52 R48 3M3 R18 R15 R43 Options depending on front panel design 1 New panel design with two switches If building this version then also fit the following parts IK R34 22K R36 Do not fit R25 amp R27 2 Old panel design This included the inverted shaped ADSR output but did not have the looping facility or range switch If you are building this then you need to fit the following parts IK 47K Do not fit R34 amp R36 Capacitors 33pF 5mm low K ceramic 100pF 5mm low K ceramic 470pF 5mm low K ceramic 100nF axial multilayer ceramic InF 100V polyester box 5mm 220nF 63V polyester box 5mm luF 63V polyester box 5mm 2u2 63V electrolytic Discrete Semiconductors 1N4148 silicon signal diode 8V2 zener diode BAT42 Schottky diode BC550 NPN transistor BCS560 PNP transistor LED 5mm green bipolar R25 R27 C16 C11 C7 C18 C8 C10 C15 C6 C5 C1 C3 C4 C9 C20 C2 C13 C14 C12 C17 C21 C19 D2 D5 D6 D7 D10 D1 D4 D3 Q1 Q2 Q3 Q4 Q5 LED Mounted off board via flyi
14. up board interconnects please see our generic Construction Guide at the project webpage or http www oakleysound com construct pdf The VC ADSR VCA PCB The issue 4 VC ADSR VCA board mounted behind a natural finish Schaeffer panel Note the use of the optional Sock4 board to mount the jack sockets Note also the two 0 1 KK headers on the lower right These headers can be attached to the 1U Upgrade module to allow for full voltage control of the modules four parameters I have provided space for the four main control pots on the PCB If you use the specified 16mm Alpha pots and matching brackets the PCB can be held firmly to the panel without any additional mounting procedures The pot spacing is 1 625 and is the same as the vertical spacing on the MOTM modular synthesiser and most of our other modules The design requires plus and minus 15V supplies The power supply should be adequately regulated The current consumption is with the LED on full 45 mA and 25mA Power is routed onto the PCB by a four way 0 156 MTA156 type connector or the special five way Synthesizers com MTA100 header You could of course wire up the board by soldering on wires directly The four pins of the four way connector are 15V ground earth panel ground 15V The earth panel connection allows you to connect the metal front panel to the power supply s ground without it sharing the modules ground line More about this later The PCB has four mounti
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