Builder`s Guide - Oakley Sound Systems
Contents
1. 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 on the LWR 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 5 and so on Power Location number Schematic Pin number 15V 1 1 Missing Pin 2 5V 3 2 Module GND 4 3 15V 5 4 Not connected 6 5 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 the PSU header This connects the panel ground with the module ground Simply solder a solid wire hoop to join the two middle pads of PSU together Building the Multimix 5 module using the Sock8 board This is t2. polarity of the power supply and the direction of the ICs in their sockets Assuming everything is OK so far it is time to apply an audio input Use a bright signal like a sawtooth output from a VCO Middle A 440Hz is a good note to use Connect up an amplifier or mixing desk input to the OUT3 MIX socket Now connect your signal to the first input You should be control the level with the top pot If you have built the Stooge version you should be able to silence the input by moving the pot to its middle position If you have built the Sum version the pot should act as an ordinary volume control Input channels two and three should perform identically Now listen to the output coming from MIX OUT This should behave much like the OUT3 MIX socket but it should also be able to pass any signal connected to IN4 Connect your VCO to IN4 and check you can hear the VCO s output through MIX OUT None of the level pots should have an affect on the level of the signal coming into IN4 If you are using a modular VCO as a source for your input signal check that the green LED turns on when the input level is turned to its maximum The LEDs track the output signal coming from the MIX OUT socket The green LED will turn on when the signal level reaches over SV which should be obtained when the input level is fully clockwise and also fully anti clockwise in the case of the Stooge variant You should note that the actual trigger value does depend a littl
3. 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 Resistors All resistors should be 0 25W 5 carbon or better Parts labelled MF should 0 25W or 0 4W 1 metal film types To save confusion with different colour codes I recommend all resistors be 0 25W or 0 4W 1 MF types 22R 75R 120R 470R 3K 3K3 3K9 10K 11K 22K MF 24K MF 33K 47K 100K MF 470K 1M 3M3 Capacitors 100nF axial multilayer ceramic luF 63V radial electrolytic 22uF 35V radial electrolytic 2u2 63V radial electrolytic R51 R5 R16 R45 R44 R41 This sets the brightness of both LEDs Increase this value to reduce brightness R43 R36 R9 R33 R1 R4 R21 R22 R8 R20 R30 R29 R37 R34 R6 R40 R38 R35 R32 R13 R2 R31 R39 R46 R49 R50 R48 R7 R47 R3
4. R15 R10 R14 R12 R24 R27 R25 R28 R23 R26 R19 R17 R18 R11 R42 C18 C19 C11 C2 C4 C15 C9 C3 C14 C13 C10 C5 C8 C12 C7 C22 C16 C17 33pF ceramic 2 5mm Discrete Semiconductors 1N4148 BC560 PNP transistor Green LED 5mm Red LED 5mm Integrated Circuits TL072 dual FET op amp LM2903 dual comparator C1 C21 C20 C6 D1 D2 D3 D4 D5 Ql LED2 mounted off board LED1 mounted off board U1 U2 U3 U4 U5 U7 U8 U6 IC sockets are recommended You need eight 8 pin DIL sockets Potentiometers 47K linear Alpha 16mm LEVEL1 LEVEL2 LEVEL3 Two Alpha pot brackets are also required The LEVEL pot has no bracket Miscellaneous Leaded Ferrite beads Knobs to fit 6mm shafts Molex or MTA 4 way header MTA100 6 way header Molex MTA 0 1 header 6 way Molex MTA 0 1 header 8 way Molex MTA 0 1 housing 6 way Molex MTA 0 1 housing 8 way Molex MTA 0 1 housing 2 way 1 4 sockets Hook up wire 26awg Wire Links L1 L2 Three off PSU Oakley MOTM power supply PWR Synthesizers com power supply UPPER for connecting to sockets LOWER for connecting to sockets UPPER for connecting to sockets LOWER for connecting to sockets LED1 LED2 Eight off mounted either on the Sock8 board or on panel You will also need three 2cm long pieces of solid core wire to make the three links on the board The actual position of these links determines ho
5. Oakley Sound Systems SU Oakley Modular Series Multimix issue 5 Four channel mixer with reversible attenuators Builder s Guide V5 0 02 Tony Allgood B Eng Oakley Sound Systems CARLISLE United Kingdom Introduction This is the Project Builder s Guide for the issue 5 Multimix 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 board interconnections and some basic testing methods For the User Manual which contains an overview of the operation of the unit advice on connecting the unit and calibration procedures please visit the main project webpage at http www oakleysound com multimix 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 5 Multimix PCB ew zp me f 88 O ou gA ip tbat a earn gt i Same PSEA SHES g Jeeu gt be ext osu A The prototype Multimix 5 in a natural finish Schaeffer panel Note the use of the PCB that holds the sockets This is an early Sock6 board with reduced input and outputs Newer
6. builds use our Sock8 or Sock8 Wide Boy PCBs I have provided space for the three 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 about 35mA for the positive rail and 30mA for the negative rail 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 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 mounting holes for M3 bolts one near each corner These are not required if you are using the two 16mm pot brackets The board size is 104mm high x 112mm deep The board has been laid out to accept connection to our Sock8 socket board This small board speeds up the wiring of the eight sockets and reduces the chances of mistakes Sock8 is available in both standard size or wide boy size for Synthesizers com compatible panels
7. e on input wave shape and frequency The red LED only turns on when the output level exceeds 11V To test this function on your modular the easiest thing to do is use two VCOs each one going to a separate input on the Multimix With two sawtooth input signals and both their level controls set to maximum the peak LED should light in time with the audible beating of the two VCOs If your LEDs fail to light make sure you haven t reversed the connections to the LEDs Another way to check the LED s operation is to use a voltage source The Oakley midiDAC is an excellent source of voltage that can be used to test the Multimix Simply connect the modulation wheel output to IN1 and turn its level pot fully up Then as you rotate the mod wheel on your controller the midiDAC will put out an increasing positive voltage At just under half way it will put out around 5V and the green LED should light Fully up the midiDAC will be producing 10 6V and this should be easily enough to tickle the RED LED to light You should now check the output from OUT and OUT2 OUT 1 should be a pot controlled version of IN1 and OUT2 should be a pot controlled version of IN2 Inserting a jack plug into either OUT1 or OUT2 will cut the respective input from the OUT3 MIX socket but not from the MIX OUT socket The MIX OUT socket will always sum IN1 IN2 IN3 and IN4 together regardless of any jack plugs inserted into OUT 1 OUT2 or OUT3 MIX Final Comments If you have any pr
8. he simplest way of connecting all the sockets to the main board The Sock8 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 six way and LWR for lower which is eight way Both headers are fitted to the bottom side of the board You need to make up two interconnects The six way one should be made so that it is 80mm long The eight way should be made to be 130mm w The prototype SVF issue 5 module showing the detail of the board to board interconnects The Multimix is wired similarly Here I have used the Molex KK 0 1 system to connect the Sock8 to the main PCB Building the Multimix 5 module by wiring the sockets manually 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 tag
9. oblems 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 Oakley Synths and Analogue Heaven mailing lists and those at Muffwiggler com Tony Allgood at Oakley Sound Cumbria UK July 2010 Updated October 2010 No part of this document may be copied by whatever means without my permission
10. s to pin 1 of LWR Pin 1 is the square solder pad All the other connections are shown in the tables below UPPER Pin Pad name Pin 1 OUT2 Pin2 NC2 Pin3 NCI Pin4 OUTI Pin5 module ground Pin6 INI LOWER Pin Pad name Pin 1 Panel ground Pin2 MIX Pin3 IN4 Pin4 OUT3 MIX Pin5 module ground Pin6 IN2 Pin 7 module ground Pins IN3 Socket Connection Connect to OUT2 Connect to OUT2 Connect to OUT1 Connect to OUT1 Connect to IN1 amp IN2 Connect to IN1 Socket Connection Connects to all sockets Connect to MIX OUT Connect to IN4 Connect to OUT3 MIX Connect to IN3 Connect to IN2 Connect to IN4 Connect to IN3 Lug Type Signal lug NC lug NC lug Signal lug NC lugs Signal lug Lug Type Ground lugs via wire frame Signal lug Signal lug Signal lug NC lug Signal lug NC lug Signal lug Light Emitting Diodes The 5V LED fitted to the panel with a translucent green cliplite A two way Molex KK housing is used to make the connection to the LED device This allows the LED to be removed easily Both LEDs are wired to the board via flying wires I twist the wires and cable tie them together to keep them neat The cathode of the LED is connected to the round pad on the board 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
11. w the three level controls work either as a simple level control or as a reversible attenuator The links can be made from component leg clippings or uninsulated tinned copper wire Simply solder a small hoop of the wire joining the relevant pads of each link For each of the three pad links LK1 2 amp 3 pad 1 is the square pad at one end pad 3 is middle pad and pad 2 is the round pad on the end If the Multimix is to be built with three reversible attenuators the Stooge variant then each of the three links need to have pads 1 and 3 linked That is the middle pad to the square pad If the Multimix is to be built with three standard level controls the Sum variant then each of the three links need to have pads 2 and 3 linked That is the middle pad to the end round pad The link LK2 configured in Stooge mode with pads 1 and 3 linked together Additional components required if using optional Sock8 board Molex MTA 0 1 header 6 way UPR Molex MTA 0 1 header 8 way LWR Molex MTA 0 1 housing 6 way UPR Molex MTA 0 1 housing 8 way LWR 112APCX Switchcraft 1 4 socket SK1 SK2 SK3 SK4 SK5 SK6 SK7 SK8 If using Molex KK you ll also need at least 28 crimp terminals Suitable lengths of wire to make up the two interconnects and three cable ties Wire Link You also need to fit a wire link into the location on the Sock8 PCB marked as L1 This ensures that the NC lug on the IN4 socket is grounded Connections
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