Ringer module, 50x200 mm, with two knobs and four jacks

This is a Kosmo format module inspired by the Befaco A*B+C. It can do four quadrant multiplication as well as serve as a VCA or an attenuverting 2 channel mixer.

Ringer and A*B+C both are based on the AD633 chip, but other than that the circuit designs are entirely different: Ringer uses a different attenuverter circuit, and includes offset trimmers not included in the Befaco module.

Git repo