12db/Oct Filter

All analog state variable filter with lots of versatility and juice. High, band, and lowpass simultaneous outputs. Resonance is uncompensated and when cranked will get loud to the point of overdrive and clipping.

There are three CV inputs that control the cutoff frequency and one that controls resonance. CV1 and REZ are adjusted such that a 5 volt signal (likewise +/-2.5 volts or -5 volts) will give a full sweep of the parameter. CV inputs 2 and 3 have a very rough 1V/oct response.

With modest resonance, a trigger/gate/hard-edge-waveform at the input will excite the filter into bursts of self oscillation, and awesome bongo/tom/kick drum sounds ensue. With resonance maxed, the module self-oscillates and can be used as a sine wave VCO.


  • 25 mA +12V
  • 25 mA -12V
  • 0 mA 5V
  • 22 mm deep
  • Ø 4.50 (6 Votes) Average Rating

Available as an assembled Module and as a DIY project.

This Module is currently available.

$80 Price in €
8 HP FilterDrum
submitted Mar 13th 2017, 13:36 by terminalhk | last Change Oct 9th 2017, 00:45 by irapotato

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