Audio Mixer

This is an audio mixer module. There’s not much to say beyond that! It takes up to three synth level AC coupled inputs and mixes them down to two identical synth level outputs. Besides attenuators on each channel, there is a level (gain) control. This allows you to mix large signals without clipping, and without having to limit the range of the input attenuators.

It’s a very simple circuit, extremely easy to build.

Schematic:

Schematics, KiCad design files, Gerbers, documentation