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Oakley Sound Systems

5U Oakley Modular Series

Analogue Synthesiser Voice

PCB set issue 1

Builder's Guide

V1.14

Tony Allgood
Oakley Sound Systems
CARLISLE
United Kingdom

Summary of Contents for 5U

Page 1: ...Oakley Sound Systems 5U Oakley Modular Series Analogue Synthesiser Voice PCB set issue 1 Builder s Guide V1 14 Tony Allgood Oakley Sound Systems CARLISLE United Kingdom...

Page 2: ...The suggested panel design for the 5U wide MOTM format module 2...

Page 3: ...The suggested panel design for the 4MU wide MU format module 3...

Page 4: ...ww oakleysound com asv 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 pd...

Page 5: ...al issue 1 Pot Switch board Other issues are built in a similar way The ASV was the first Oakley module to use vertically mounted pots and switches This type of construction allows for much shallower...

Page 6: ...values R63 R64 R67 and R68 should be high precision 0 1 or better R35 is a positive temperature coefficient resistor with a nominal value of 1K and temp co of anywhere between 3000ppm K and 3900ppm K...

Page 7: ...R71 R122 For MOTM Oakley format This is to be used if you have already have older Oakley VCOs and want your ASV VCOs to behave identically to the Key CV input Anyone with a midiDAC issue 4 and older...

Page 8: ...rolytic C3 C10 C16 C20 10uF 35V electrolytic C58 47uF 25V electrolytic C32 C35 Cx is only fitted to the underside of the board between pins 1 and 2 of U16 if you are using the main board with an issue...

Page 9: ...00 3 way BUS MTA100 2 way OUT MTA100 6 way PWR1 PWR2 MTA156 4 way PSU1 PSU2 2 x 8 way 0 1 boxed header HDR1 HDR2 HDR3 10 way SIL 0 1 socket CN1 CN2 CN3 CN4 CN5 CN6 CN7 CN8 10 way SIL 0 1 header OSC1 O...

Page 10: ...ar temperature This reduces the amount of drift in the filter s and LFO s operating frequencies These boxed IDC headers are polarised as they have a notch taken out of the side to ensure an inserted s...

Page 11: ...K R10 R4 1M R40 R41 R39 R6 R8 R38 1K KRL 3500ppm K TC1 TC2 fit side by side on top surface of U6 Capacitors 100nF axial multi layer ceramic C6 C15 C18 C23 C5 C13 C14 C28 C19 C16 C17 C20 C27 C24 47pF C...

Page 12: ...t OSC1 OSC2 OSC3 OSC1 to OSC3 are mounted on the underside of the board and soldered from the top IC sockets are optional but recommended for DIY projects There are seven 8 pin and one 14 pin DIL sock...

Page 13: ...470K R7 R11 R19 R25 Capacitors 100nF axial multi layer ceramic C1 C7 C8 C5 C15 C3 C12 C16 C11 33pF C0G ceramic 2 5mm C6 C9 100pF C0G ceramic 2 5mm C2 C14 2u2 50V polyester C10 C17 C18 C19 2u2 63V ele...

Page 14: ...pot and the inside surface of either the MOTM format panel or the shim panel for MU builds I recommend using the same thickness of flat washer as those that come with the pots Switches SPDT on on swit...

Page 15: ...R29 470K R8 R15 R23 R31 Capacitors 100nF axial multi layer ceramic C1 C5 C15 C3 C19 C20 C9 C7 C10 C11 C14 33pF C0G ceramic 2 5mm C8 C12 100pF C0G ceramic 2 5mm C2 C6 C17 C18 2u2 50V polyester C13 C21...

Page 16: ...l M7 flat washers for all 28 pots to go between the pot and the inside surface of either the MOTM format panel or the shim panel for MU builds I recommend using the same thickness of flat washer as th...

Page 17: ...way 0 1 IDC socket 6 off 16 way 0 05 IDC ribbon cable 0 3 metres Additional Hardware For securing the main board to the pot switch board and the main board to the VCO board you can use male female sp...

Page 18: ...d washers between the panel and pot The thickness of the washer needed will depend on the thickness of the panel used For both the 3mm thick Schaeffer panel and the 1 5mm MU panel with shim sub panel...

Page 19: ...y pleasing and the knobs are easy to adjust The first prototype unit using a printed Schaeffer panel The nuts for the switches have not yet been fitted The switches used in this project are from the G...

Page 20: ...the chip The AS3310 you purchase and indeed any CEM3310 you have may well have a Vp of 5 0V and you can use 39K for R133 and R148 However using 36K as shown in the parts list will allow perfectly acce...

Page 21: ...ility in VCO2 s pulse width when the wiper of PWM pot is set away from either of its ends This can be corrected by slightly restricting the frequency response of the amplifier that sums together the c...

Page 22: ...e board surface and be parallel to it If one places a pot into the board and then solders all three pins the pot will naturally sit at an angle and make it difficult to fit the pot s thread through th...

Page 23: ...wever these are not needed for such a short length of cable and can actually make construction of the assembly more difficult If your connectors have come with such a clamp you can simply not fit it T...

Page 24: ...t the Pot Switch Board to the panel it is necessary to fit the hex spacers to the board as this is tricky to do once the panel is in place The spacers recommended are male female M F hex spacers with...

Page 25: ...lace on the switches and the slim washers on the pots prior to the panel or sub panel being fitted on top The Schaeffer panel is 3mm thick and includes 2 1mm deep blind holes on the reverse side of th...

Page 26: ...the small holes in the shim plate Carefully place the Schaeffer panel or the shim plate onto the pot switch board easing in the eight ADSR pots first and then the others working your way up the front...

Page 27: ...rd which will eventually secure the VCO board Like the pot switch board this spacer will be sticking away from the panel but this time it s fitted to the top side of the board It is secured on the und...

Page 28: ...3 nut three flat washers and two toothed washers The final thing to do is fit the three ribbon cables making sure that any polarising lugs are aligned correctly Pin 1 the red stripe on the cable is to...

Page 29: ...is not possible MOTM and Oakley The PSU1 and PSU2 power sockets are 0 156 Molex MTA 4 way headers Friction lock types are recommended This system is compatible with MOTM systems PSU1 Pin number 15V 1...

Page 30: ...er the middle two pads of PSU2 This link connects the socket and panel ground with the module ground Simply solder a solid wire hoop made from a resistor lead clipping or bit of solid core wire to joi...

Page 31: ...d with its three position octave switch Check that VCO2 s pitch changes significantly with the VCO2 Tune control Check too that the Sync switch locks the pitch of VCO2 so that the VCO2 Tune control ch...

Page 32: ...nly one narrow band of frequencies and create sounds reminiscent of a wah wah pedal when the ASV s resonance is turned up Turn the VCF FM2 control up and you should hear the LFO modulating the filter...

Page 33: ...s 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 fo...

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