Expression Pedal Interface

This is a module to plug an expression pedal into. You can also plug a CV into it, in which case the pedal will act as a CV attenuator. If you don’t plug a CV in then the module will produce an output CV that is varied by the pedal. The upper limit of the CV range is governed by a pot. You can even use the module without a pedal, using the pot to vary the output CV.

Schematic:

Expression pedal interface schematic

Stripboard layout:

Expression pedal interface stripboard layout

Schematics, KiCad design files, Gerbers, documentation