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Midimuso CV-12 Assembly Instructions

Orac
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Midimuso CV-12 ORAC
Thanks for buying the Midimuso CV-12 ORAC PCB.
This booklet will help you construct / set up the kit.
For more information on modes, chaining, re-triggering, aftertouch, overflow and
polyphony, please refer to the main CV 12 manual on the website (midimuso.co.uk).
Component placement (N.B. Not all the PCB holes are used)
JP1 should be jumpered from centre to pin 3 (adjacent, right) so the IC receives MIDI from
the 5 pin DIN connector. C3 (1uF) may be polarised.
Its + terminal should be nearest the top edge of the board.
They are marked as:
105 = 1 000 000pF = 1uF
104 = 100 000pF = 0.1uF = 100nF
103 =
10 000pF = 10nF = 0.01uF

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Summary of Contents for Midimuso CV-12

  • Page 1 This booklet will help you construct / set up the kit. For more information on modes, chaining, re-triggering, aftertouch, overflow and polyphony, please refer to the main CV 12 manual on the website (midimuso.co.uk). Component placement (N.B. Not all the PCB holes are used) JP1 should be jumpered from centre to pin 3 (adjacent, right) so the IC receives MIDI from the 5 pin DIN connector.
  • Page 2 The board can produce 1V / octave or 1.2V / octave or 0.5V / octave just by setting the trimmer correctly. You'll need to increase the power supply voltage to 15V for the 1.2V / octave scheme On power-up, adjust the trimmer until you see: Port 1V / Octave 1.2V / Octave...
  • Page 3 Pitch Voltages. Volts / Octave Moog scheme: Output MIDI key Value (hex) Value (decimal) 1V / oct 1.2V / oct 0.5V / oct --------------------------------------------------------------------------------------------------------------- 0.00 0.00 0.00 1.00 1.20 0.50 2.00 2.40 1.00 3.00 3.60 1.50 3.25 3.90 1.625 4.00 4.80 2.00 5.00...
  • Page 4 0x05 5 = mode 4B There are MIDI files on the midimuso website to make this easier to do. You don't have to reset the IC after a Mode change and the IC will remember it is in the new mode even after power off. The mode can be changed again at any time.
  • Page 5 Continuity guide Schematic...

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