The SeM20 is a 2-pole state variable filter loosely based on the Oberheim SEM filter, but with the resonance section of the MS20 grafted on for an extra bit of grit! It won’t self oscillate usually, but with the right input, or the High Pass out plugged into the Input, it will howl. The Input section is set up much like the input of the OSCar, when the input is at 5 it’s full volume. Beyond 5 the filter will begin to overdrive and distort.
SeM20 Build Document – Assembly Guide
Features:
- 12db high pass, low pass and notch filter
- 6db band pass
- 2 CV frequency inputs with attenuators
- Notch filter balance – sweeps between high and low pass
- Width: 14HP
- Max Depth: 30mm
- Power: 70mA@ +12V