PCB and FR4 front panel (only) for a 4 quadrant multiplier synth module. This module is in LMNC's Kosmo format (20 cm high) and is 5 cm wide.

The circuit takes three inputs, A, B, and C, and outputs A times B plus C. (Or really A times B, attenuverted and divided by 5, plus C, attenuverted.) It can be used to produce results similar to a ring modulator — complex sounds built from sums and differences of the input harmonic frequencies. It can also be used for more utilitarian purposes, such as a 2-channel attenuverting mixer (CV or audio) or a VCA.

The user needs to source parts and assemble them. (Photo of my own assembled module for illustrative purposes only.) Easy through-hole construction.

Be sure to see the Git repository (linked below) for BOM, schematic, and other information.