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Look Mum No Computer

#1222 Performance VCO

$199.00 $249.00
Available Immediately
Product number: CV4213

CEM3340 chip based VCO

  • +12V 52mA
    -12V 17mA
    +5V 0mA
    Width 12HP
    Depth 32mm


VCO based on the CEM3340 chip.

The 1222 Performance VCO is Look Mum No Computer's first Oscillator PCB Design. Born from frustration of playing shows, or not having a tuner to hand and getting in tune enough to get going, instead of sitting around being out of tune. Its also got an octave knob. a fine tune knob that is exactly an octave with a centre point of C making it easy to find the note you need. Big simple controls, pulse width, PWM, fine tune, Extra CV, Sync, FM, Square, Ramp and Triangle outputs. It also has a rear connection called LINK, which will be for future use, as i will be making an oscillator drive a nice means of driving lots of oscillators at once, as well as a mixer module so no need to patch all of the oscillators together they will be connected from the back. A final design is like a cross mod module that will turn them into a sort of fart box thing. This is all future ideas, but if you cant wait check the schematic it will make sense!


  • Octave Switch adds 0-4 volts—or 5
    octaves—to the 1v/oct signal.
  • Fine Tune has a one octave range.
  • Tuner shows the nearest note and
    LEDs indicate wether it’s flat (left),
    sharp (right) or bang on (middle).
  • Pulse Width can be adjusted from
  • Additional Frequency CV input and
  • Pulse Width Modulation CV input
    and attenuator.
  • Frequency Sync input. Works best
    with simple waveforms.
  • Frequency Modulation CV input.
  • Simultaneous Pulse, Ramp and
    Triangle outputs. Note that the outputs
    are unipolar audio signals with levels
    that vary from +4v to +8V

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