Arduino-based FM VCO
Here’s another module I based on HAGIWO’s design. It’s an FM VCO with two operators: a carrier frequency and a modulation frequency. It uses the Arduino Mozzi library.
It works with 1V/Oct CV sources, but with a limited range.
You can also check out HAGIWO’s demo on Youtube.
The original schematics and code I used for this is from HAGIWO’s blog. The diodes I used were BAT41 and the OpAmp was TL072.