MA20

Low and high pass filter

Two audio inputs.
- HP IN
- LP IN
Patch the same signal to both inputs for bandpass-like response.

Two FM inputs
High pass / Low pass VCF loosely based on the later, OTA, Korg MS20 VCF.

• FM 1 with a Push/Pull potentiometer to attenuate and/or invert the CV signal
• FM 2 is unattenuated

Resonance control pot that ranges from 0 to self oscillation. This is highly dependent on the input signal level(s).

The module is built and trimmed for:
- IN jack: +/-5V audio or CV
- OUT jack: +/-5V typical
- FM 1 and FM 2: 0-5V span the full response range. Responds to negative voltages when the FREQUENCY pot is anywhere other than full CCW (7').

Various pcb headers to easily normallize two MA20 modules together.

http://www.megaohmaudio.com/MA20VCF.html