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Oakley 5U Modular Series Builder's Manual

Fourmix cv and audio mixer, fourmix pcb issue 1 & 2
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Oakley Sound Systems
5U Oakley Modular Series
Fourmix
CV and Audio Mixer
Fourmix PCB Issue 1 & 2
Builder's Guide
V2.0
Tony Allgood
Oakley Sound Systems
CARLISLE
United Kingdom

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Summary of Contents for Oakley 5U Oakley Modular Series

  • Page 1 Oakley Sound Systems 5U Oakley Modular Series Fourmix CV and Audio Mixer Fourmix PCB Issue 1 & 2 Builder's Guide V2.0 Tony Allgood Oakley Sound Systems CARLISLE United Kingdom...
  • Page 2 Introduction This is the Project Builder's Guide for the issue 1 and issue 2 Fourmix 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.
  • Page 3 The Fourmix PCB This is the prototype issue 1 Fourmix module behind a natural finish 1U wide Schaeffer panel. Note the use of the optional Sock6 socket board to facilitate the wiring up of the six sockets. The issue 1 main PCB is 78mm (width) x 124mm (height), and the issue 2 main PCB is 75mm (width) x 124mm (height).

  • Page 4: Parts Lists

    Parts Lists There are two types of Fourmix boards, issue 1 and issue 2, please ensure that you use the right parts list for the board you have. 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.
  • Page 5 Capacitors 100nF axial ceramic C9, C3, C15, C7, C5, C12, C8, C18, C14, C4 33pF C0G 2.5mm ceramic C10, C13 100pF C0G 2.5mm ceramic C16, C17 1uF, 63V electrolytic 2u2, 63V electrolytic C6, C11 22uF, 35V electrolytic Discrete Semiconductors BC560 PNP small signal transistor 1N4148 signal diode D1, D2, D3, D4, D5 2V7 zener diode...
  • Page 6 Miscellaneous Leaded axial ferrite beads L1, L2 MTA156 4 way header – Oakley/MOTM power supply MTA100 6-way header – Synthesizers.com power supply Molex/MTA 0.1” header 8-way – for connecting to sockets Molex/MTA 0.1” housing 8-way – for connecting to sockets Molex/MTA 0.1”...
  • Page 7 Issue 2 Fourmix Parts List Resistors 1% 0.25W metal film types are to be recommended simply because they are better quality and lower noise components. However, 5% ones can be substituted in any of the places if you wish. R5 will probably have to be a 5% type since getting hold of a 1% metal film resistor in this value may be difficult.
  • Page 8 LEVEL1, LEVEL2, LEVEL3, LEVEL4 Three 16mm pot brackets. Miscellaneous Leaded axial ferrite beads L1, L2 MTA156 4 way header – Oakley/MOTM power supply MTA100 6-way header – Synthesizers.com power supply Molex/MTA 0.1” header 8-way – for connecting to sockets Molex/MTA 0.1” housing 8-way –...
  • Page 9 Components required if using optional Sock6 board Molex/MTA 0.1” header 8-way Molex/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 SK1, SK2, SK3, SK4, SK5, SK6 The link L1 is not to be fitted on the Sock6 PCB. If using Molex KK you'll also need at least 24 crimp terminals.
  • Page 10 PSU. * Issue 2 Fourmix main boards now connect the unused pin 6 of the MU connector to socket ground. With the link on PSU not fitted, and using an Oakley MU Dizzy distribution board...
  • Page 11 with a five way power cable, allows the socket ground to be kept separate from module ground to prevent ground loops. Building the Fourmix 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.
  • Page 12 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.
  • Page 13 Testing 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 the ICs in their sockets and the polarity of the electrolytic capacitors.

  • Page 14: Final Comments

    Oakley modules. 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.