Builder`s Guide - Oakley Sound Systems
Contents
1. Sock6 socket board This small board speeds up the wiring of the six sockets and reduces the chances of building mistakes Issue 1 and 1 1 Dual VCA Parts List For general information regarding where to get parts and suggested part numbers please see our useful Parts Guide at the project web page or http www oakleysound com parts pdf There are three ways to populate the Dual VCA board and it depends on which module you are building The Dual VCA needs only one Dual VCA board which is populated accordingly The Quad VCA uses two Dual VCA boards one is the master which handles channels 3 and 4 and the other is the slave which handles channels 1 and 2 The master and slave boards are populated slightly differently and this is indicated in the parts lists below 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 Resistors 1 0 25W metal film types are to be recommended simply because they are better quality components However 5 ones can be used in a2. nA BW NN 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 Building the Dual VCA module using the Sock6 board This is the simplest way of connecting all the sockets to the main board The Sock6 board should be populated in the way described in our construction guide found on the project webpage There are only two headers UPR for upper which is eight way and LWR for lower which is four way Both headers are fitted to the bottom side of the board The wire link L1 should also be fitted to the Sock6 board You need to make up two interconnects The eight way one should be made so that it is 95mm long The four way should be made to be 110mm The Dual VCA issue I prototype module showing the detail of the board to board interconnect Here I have used the Molex KK 0 1 system to connect the Sock6 to the main PCB 10 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
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4. 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 LWR Pin 1 is the square solder pad 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 Dual VCA UPR Pin Pad name Socket Connection Lug Type Pin 1 Module ground IN2 NC Pin2 IN2 IN2 Signal Pin3 NC2 Not used Pin4 OUT2 OUT2 Signal Pin5 NCI OUTI NC Pin6 OUTI OUTI1 Signal Pin7 Module ground INI NC Pins INI INI Signal LWR Pin Pad name Socket Connection Lug Type Pin 1 Panel ground Connects to all sockets Ground lugs Pin2 CV2 CV2 Signal Pin3 Module ground CV1 amp CV2 NC lugs Pin4d CVI CV1 Signal Tables continued overleaf 11 Quad VCA channels 1 and 2 UPR Pin Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 LWR Pin Pin 1 Pin 2 Pin 3 Pin 4 Pad name Module ground IN2 NC2 OUT2 NCI OUTI Module ground IN1 Pad name Panel ground CV2 Module ground CV1 Socket Connection IN2 IN2 OUT2 OUT2 OUTI OUTI INI INI Socket Connection Connects to all socket
5. the ICs in their sockets and the polarity of the electrolytic capacitors The next thing to do is to make sure that each VCA is passing audio Send an audio signal into the input socket for each VCA and make sure that its Gain pot acts as a simple volume control The volume should change from completely off to unattenuated in a smooth fashion as you turn the pot Moving the relevant CV pot should do nothing at this stage You should notice a small dead zone at the start of the Gain pot s rotation This is to ensure that the VCA is turned fully off with the pot at its minimum value Introduce a little bit of CV modulation to check the CV input A simple LFO waveform like a triangle is a good start Set the gain pot to middle and the CV pot should control the depth of modulation Set the CV depth pot to its maximum position You should hear the volume of the output signal rising and falling with the LFO Reduce the CV depth with the pot and hear how the modulation depth decreases to nothing with the pot in the middle and then increases again as the pot moves around to the inverting position Make sure all VCA channels work identically Check also that the output of VCA1 passes to the Mix output OUT2 in the Dual VCA or OUT4 in the Quad VCA if there no jack inserted into the OUT1 socket If all this happens the chances are that you have a working module and it is now time to calibrate The User Manual gives full details on how to calibrate your mo
6. without spaces for these components Discrete Semiconductors BC560 PNP small signal transistor Q1 Q2 1N4148 signal diode D1 D2 Integrated Circuits TLO72ACP dual FET op amp U2 U4 U5 U6 U7 U9 U10 LM13700 U3 U8 LM4040DIZ 10 0 10V reference U1 The LM4040CIZ 10 0 is also suitable Trimmers preset resistors 47K or 50K 6mm horizontal LVL1 LVL2 100K 6mm horizontal OFF1 OFF2 Trimmers are to be fitted to the top side of the board for the Dual VCA and the master board in the Quad VCA However when building the slave board for the Quad VCA then all four trimmers should be fitted to the underside of the PCB and soldered from the topside Potentiometers Pots All pots Alpha 16mm PCB mounted types 47K or 50K linear GAINI CV1 GAIN2 CV2 Three 16mm pot brackets Switch Two single pole double throw SPDT toggle switches are required for the optional AC DC mode selection Miscellaneous Leaded ferrite bead L1 L2 MTA156 4 way header PSU Oakley MOTM power supply MTA100 6 way header PWR Synthesizers com power supply Fit the ferrite beads and power header only if building the Dual VCA module or the master board of the Quad VCA module The slave board of the Quad VCA gets its power from the master board and needs no ferrite beads or power header fitted Molex MTA 0 1 header 8 way UPR for connecting to sockets Molex MTA 0 1 housing 8 way UPR for connecting to sockets Molex MTA 0 1 hea
7. Oakley Sound Systems SU Oakley Modular Series Dual Voltage Controlled Amplifier amp Quad Voltage Controlled Amplifier Dual VCA PCB issues 1 amp 1 1 Builder s Guide V1 1 3 Tony Allgood B Eng PGCE Oakley Sound Systems CARLISLE United Kingdom Introduction This is the Project Builder s Guide for the issues 1 and 1 1 Dual and Quad Voltage Controlled Amplifier 5U modules 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 For the User Manual which contains an overview of the operation of the unit and the calibration procedure please visit the main project webpage at http www oakleysound com vca d 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 up board interconnects please see our generic Construction Guide at the project webpage or http www oakleysound com construct pdf The Issue 1 and 1 1 Dual VCA PCB FCAR Tay cathy 2 DeLd 5 3 Set Sra g Ar Saa TTE PE smth eey OT ATAT a Lc oa Emp 2 gon This is the issue 1 Oakley Dual VCA module behind a natural finish 1U wide Schaeffer panel Issu
8. der 4 way LWR for connecting to sockets Molex MTA 0 1 housing 4 way LWR for connecting to sockets For Dual VCA modules only Do not fit BUSS and link out pads as directed in the Links section For Quad VCA modules both master and slave 2x 50 1 IDC boxed header BUSS 2x 50 1 IDC socket Two off for cable interconnect 10 way 0 05 IDC cable 120mm long The two boards used in the Quad VCA are connected together with the BUSS cable This flat ribbon cable carries the two outputs of the first two VCA channels to the master board and carries the power to the slave board Links These are made from either left over bits of wire from the snipped legs of resistors or small lengths of thin solid core wire For the Dual VCA only On the BUSS header link out pads 3 amp 4 and pads 7 amp 8 SLV1 and SLV2 are left unfitted although you should fill the unused pad holes with a bit of solder For the Quad VCA slave PCB only Link out SLV1 and SLV2 For the Quad VCA master PCB only SLV1 and SLV2 are left unfitted although you should fill the unused pad holes with a bit of solder Other Parts Required Switchcraft 112APC 1 4 sockets Six off mounted either on the Sock6 board or on panel Two 27mm knobs and two 20mm knobs Four cable ties Around 2m of insulated multistrand hook up wire for the switch and socket connections Components required if using optional Sock6 board Molex MTA 0 1 header 8 way M
9. dule 14 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 Allgood 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 the Muffwiggler com forums Tony Allgood at Oakley Sound Cumbria UK March 2011 updated August 2012 No part of this document may be copied by whatever means without my
10. e 1 1 is very similar Note the use of the optional Sock6 socket board to facilitate the wiring up of the six sockets On the Dual VCA printed circuit board I have provided space for the four main control pots If you use the specified 16mm Alpha pots and matching brackets the PCB can be held very firmly to the panel without any additional mounting procedures The pot spacing on this board is different to many of our other 5U modules instead of 1 625 it is 1 375 Used in conjunction with smaller 20mm diameter knobs this still allows for an attractive module design and finger friendly tweaking The design requires plus and minus 15V supplies The power supply should be adequately regulated The current consumption is about 26mA for each rail Power is routed onto the main PCB by either 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 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 main PCB has four mounting holes for M3 bolts one near each corner These are not required for panel mounting if you are using the three 16mm pot brackets The board size is 109mm deep x 123mm high The main board has been laid out to accept connection to our
11. ll places if you wish R26 and R52 will probably have to be a 5 type since getting hold of a 1 metal film resistor in this value is sometimes not trivial 100R R51 R25 1K R31 R43 R29 2K2 R3 R49 R23 4K7 R16 R30 12K R24 R50 R46 R20 22K R21 R40 R1 R2 33K R45 R39 R48 R15 R14 R12 39K R17 R47 ATK R10 R13 R38 62K R37 R9 82K R7 R33 R35 R4 100K R11 R18 R41 R42 220K R5 R36 R6 R34 2M2 R52 R26 For the Dual VCA module only 4K7 R22 39K R44 R19 and R27 are not fitted For the Quad VCA Master module 4K7 R19 R22 R27 39K R44 For the Quad VCA Slave module R19 R22 R27 and R44 are not fitted For issue 1 PCBs only R8 R28 R32 and R53 are zero ohm links You can also use any low value 0 25W or 0 5W resistor from 1R to 4R7 in this particular application Alternatively and most certainly the cheapest way of doing things is to simply use a small piece of uninsulated solid wire for each link Issue 1 1 PCBs are tracked appropriately so do not need these components Capacitors 100nF axial ceramic C19 C12 C2 C11 C20 C6 C21 C24 C1 C18 C22 C5 33pF COG 2 5mm ceramic C17 C4 C3 C16 470pF COG 2 5mm ceramic C7 C8 luF 63V polyester film C15 C23 2u2 63V electrolytic C25 C26 For issue 1 PCBs only C9 C10 C13 and C14 are not fitted and their positions should be left empty It is however worthwhile to fill the solder pads with a bit of solder Issue 1 1 PCBs are constructed
12. olex MTA 0 1 housing 8 way Molex MTA 0 1 header 4 way Molex MTA 0 1 housing 4 way 112APC Switchcraft 1 4 socket UPR UPR LWR LWR SK1 SK2 SK3 SK4 SK5 SK6 A single wire link is to be fitted to L1 on the Sock6 PCB If using Molex KK you ll also need at least 24 crimp terminals Suitable lengths of wire to make up the two interconnects and four cable ties 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 actually pin 3 and so on Power Location number Schematic Pin number 15V Missing Pin 5V Module GND 15V Not connected 1 NnB WN
13. s CV2 CV1 amp CV2 CV1 Quad VCA channels 3 and 4 UPR Pin Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 LWR Pin Pin 1 Pin 2 Pin 3 Pin 4 Pad name Module ground IN2 NC2 OUT2 NCI OUTI Module ground IN1 Pad name Panel ground CV2 Module ground CV1 Socket Connection IN4 IN4 Not used OUT4 OUT3 OUT3 IN3 IN3 Socket Connection Connects to all sockets CV4 CV3 amp CV4 CV3 12 Lug Type Ground lugs Signal NC lugs Signal Lug Type NC Signal Signal NC Signal NC Signal Lug Type Ground lugs Signal NC lugs Signal Wiring the Switches Sly e He Sta eae ce eana Channel 2 s AC DC switch using an APEM single pole double throw switch Make sure the switch and PCB are secured to the panel before soldering the two wires The panel design features two switches Both are wired in exactly the same way with two pieces of straight solid core wire as shown in the picture above Note how it is the two left most tangs that are soldered into the pads on the board The right hand tang actually the top tang when the module is mounted correctly is not connected to anything 13 Testing testing 1 2 3 Apply power to the unit making sure you are applying the power correctly Check that no device is running hot Any sign of smoke or strange smells turn off the power immediately and recheck the polarity of the power supply and the direction of
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