Eurorack VCO-1

A VCO module based on a circuit by Thomas Henry, with modifications by Tom Whitwell to use Eurorack's voltage standard.

I designed the PCBs in KiCad, hand matched a transistor pair for the expo converter and simulated the circuit in LTSpice to make sure everything would work fine. The front panel was made with a pen plotter on a thick piece of cardboard.