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Oakley 5U Builder's Manual

Analogue synthesiser voice
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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

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Summary of Contents for Oakley 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.
  • Page 3 The suggested panel design for the 4MU wide MU format module.
  • Page 4 This is the Project Builder's Guide for the issue 1 Analogue Synthesiser Voice (ASV) module from Oakley Sound. This document contains a basic introduction to the board set, a full parts list for the components needed to populate the boards and how to connect the boards together.
  • Page 5 The original 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 modules.

  • Page 6: Parts Lists

    Parts Lists For general information regarding where to get parts and suggested manufacturer part numbers please see my 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.
  • Page 7 R41, R46, R77, R120, R14, 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 should also build this version.
  • Page 8 Capacitors 100nF axial multi-layer ceramic C43, C23, C42, C19, C9, C66, C24, C27, C18, C28, C22, C40, C53, C33, C1, C34, C59, C12, C52, C11, C69, C17, C38, C44, C25, C14, C67, C2, C56, C46, C21, C30, C4, C50, C41, C39, C49, C26, C54, C45, C48, C68 10pF C0G ceramic 2.5mm 33pF C0G ceramic 2.5mm...
  • Page 9 Integrated Circuits CD4013 dual D-type flip-flop CD4093 quad NAND gate 4558 dual op-amp AS3310 envelope generator U24, U25 LM13700 dual OTA U8, U14, U15 LM4040-10 10V reference LT1013 dual op-amp U3, U11, U19 OPA2134 dual audio op-amp TL072CN dual op-amp U22, U6, U16, U17, U13, U20 TL072ACP dual op-amp U4, U18...
  • Page 10 The two sets of transistor pairs, Q3 and Q4, and, Q9 and Q10, can be tied together with a cable tie to help keep both devices at a similar temperature. This reduces the amount of drift in the filter's and LFO's operating frequencies.
  • Page 11 ASV Dual VCO Board issue 1 Parts List Resistors 1% 0.25W metal film types are recommended for all values. R12, R1 820R R29, R30 R31, R32 R46, R47, R35, R50, R48, R45, R21, R22, R42, R5, R33, R49, R36, R37, R43, R9 R3, R13 R28, R16 R11, R15, R17, R2, R20, R24...
  • Page 12 Integrated Circuits LM393 dual comparator U7, U8 LT1013 dual op-amp U1, U2 THAT300 NPN array TL072ACP dual FET op-amp U3, U4, U5 Miscellaneous 10-way SIL socket * 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.
  • Page 13 ASV Pot & Switch Board issue 1.1 Parts List Note that this is for issue 1.1 Pot Boards only. Check which issue board you have before starting to populate your board. Resistors 1% 0.25W metal film types are recommended for most values. R1, R2, R3 and R4 should be high precision 0.1% or better.
  • Page 14 Integrated Circuits LM4040-10 10V reference LT1013 dual op-amp TL072ACP dual op-amp U1, U4, U5 Potentiometers 50K linear ENV1_DEPTH, VCF_FREQ, LFO_RATE, ENV1_SUSTAIN, VCO2_LEVEL, SUB/EXT_LEVEL, ENV1_RELEASE, ENV1_DECAY, RESONANCE, ENV2_ATTACK, VCO2_PW, VCO1_PW, ENV2_RELEASE, VCO2_TUNE, VCO2_PWM, VCO1_PWM, VCF_FM1, TUNE, VCF_TRACK, VCO1_LEVEL, VCF_FM2, ENV2_DECAY, ENV1_ATTACK, VCO1_VCA, SHAPE, ENV2_SUSTAIN 50K audio (log) VCO1/2_FM, VCO2_FM I recommend additional M7 flat washers for all 28 pots to go between the pot and the inside surface...
  • Page 15 ASV Pot & Switch Board issue 1.2 Parts List Note that this is for issue 1.2 Pot Boards only. Check which issue board you have before starting to populate your board. Resistors 1% 0.25W metal film types are recommended for most values. R1, R2, R3 and R4 should be high precision 0.1% or better.
  • Page 16 Integrated Circuits LM4040-10 10V reference LT1013 dual op-amp TL072ACP dual op-amp U3, U4, U5, U6 Potentiometers 50K linear ENV1_DEPTH, VCF_FREQ, LFO_RATE, ENV1_SUSTAIN, VCO2_LEVEL, SUB/EXT_LEVEL, ENV1_RELEASE, ENV1_DECAY, RESONANCE, ENV2_ATTACK, VCO2_PW, VCO1_PW, ENV2_RELEASE, VCO2_TUNE, VCO2_PWM, VCO1_PWM, VCF_FM1, TUNE, VCF_TRACK, VCO1_LEVEL, VCF_FM2, ENV2_DECAY, ENV1_ATTACK, VCO1_VCA, SHAPE, ENV2_SUSTAIN 50K audio (log) VCO1/2_FM, VCO2_FM...

  • Page 17: Additional Hardware

    Pin 1 lines up with the square pad on the PCB. Pin 1 is normally depicted by a small triangle on the body of the header. ** Do read the section on building socket boards in the Oakley Construction Guide. Interconnects 2 x 8 way 0.1”...

  • Page 18: Parts Information

    13mm. An example of such a trio are shown below and similar knobs can be obtained from online guitar parts and effects retailers. The above control knobs give the whole panel a standard 5U modular look and it is in this style that...
  • Page 19 I created the digital artworks for the documentation and website. For my first two prototype models, however, I decided to do something a little different and go with an all black look. For the large control knob I chose Thonk's MXR clones. For the medium sized ones I used original Davies Molding's skirted 'bold small' knobs, also available from Thonk.
  • Page 20 The FET, sometimes called JFET, used in the filter on the main board is the somewhat hard to get J201. Mouser sell them as their part 106-J201. I should warn you they aren't terribly cheap compared with other small signal FETs. The small positive temperature coefficient (PTC) resistor used in the filter is +3300ppm/K, although +3000ppm/K devices will do the job well enough too.
  • Page 21 For issue 1.1 Pot/Switch Boards only: Modification Required An error in the copper tracking of the issue 1.1 ASV Pot/Switch board results in a small amount of bleedthrough from VCO1's reset pulse to the wiper of the PWM pot of VCO2. This manifests itself as a slight instability in VCO2's pulse width when the wiper of PWM pot is set away from either of its ends.
  • Page 22 Soldering the Front Panel Components Soldering the pots and switches on the ASV's Pot Board is relatively straightforward. They are mounted from the top side of the board and soldered from the underside. However, there are a few points worthy of mention. The ASV Pot Board is a large board with a lot of copper on its underside.

  • Page 23: Ribbon Cable Connections

    Ribbon Cable Connections The main board and socket board are connected together with three identical 16-way ribbon cables. These cables are terminated in sockets that are called insulation displacement connectors (IDC). They are called this because they make connection with the cable by piercing the plastic insulation that surrounds the wire inside the cable.

  • Page 24: Mechanical Assembly

    Mechanical Assembly The Oakley ASV has been designed with ease of construction in mind. That said, it is a complex project with four circuit boards and over three hundred individual parts. It is also designed with the circuit boards parallel to the front panel. While this does create a shallow module it does make construction somewhat more difficult than a single board mounted at right angles to the panel.
  • Page 25 haven't fitted the switches yet, you must now push them into their correct locations on the Pot/Switch board but do not solder them just yet. Move every switch's toggle to its middle position, even the ones that don't naturally have a middle position. Whether you have chosen to use the MOTM format Schaeffer panel or the MU panel with its shim plate, each pot will need to be fitted with an additional thin M7 flat washer, and each switch with its toothed washer.
  • Page 26 The pot lugs fit into small holes in the sheet without having to go through the main panel. This sub-panel or shim plate is provided when you purchase the MU panel from Oakley Sound Systems. You'll notice that the shim plate may have a slight bow to it, this is not a problem as it will straighten out once squashed up against the aluminium panel.
  • Page 27 lugs haven't slipped out of their holes. Gently tighten each pot nut making sure you do not over tighten or scratch the panel's front surface. Now fit and tighten the switch nuts. If you chose not to solder the switches before fitting the panel, once the switches are secured with their nut, you can now solder their leads.
  • Page 28 Each of the four 11mm M-F spacers use a 6mm screw, an M3 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.

  • Page 29: Power Connections

    The ASV main PCB has four power headers, two MOTM/Oakley and two MU. Whether you choose MOTM/Oakley or MU, both headers of the same type must be connected back to your power supply or power supply distribution system. That is, both MOTM/Oakley or both MU. It is best not to mix types, so using one MOTM/Oakley and one MU is not recommended.
  • Page 30 With the link not fitted, and using an Oakley MU distribution board with a five way power cable, will allow the socket ground to be kept separate from module ground to prevent ground loops. The two MOTM/Oakley headers fitted. Note that the solder pads for the unused PWR headers can be filled with solder.

  • Page 31: Testing Procedure

    Testing Procedure Apply power to the unit making sure you have connected the power leads correctly. Both power leads should be fitted. 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 all the ICs in their sockets and the polarity of the electrolytic capacitors.
  • Page 32 Sustain pot of ENV2 to its maximum. Turn the three Mixer pots, and the four small pots in the filter section to their minimums. Listen to the main output. It should be silent. Now turn up the VCO1 to VCA pot, and you should hear a triangle wave at the same pitch as VCO1. Turn the Sustain pot of ENV2 down and the volume of the triangle wave should also go down.

  • Page 33: Final Comments

    If you can't get your project to work and you are in the EU, 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.

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