The O2 source code

Like the Minipops 7 rhythm box?
Yes, the one that Jean Michel Jarre used on the Oxygen album.

Here is the source code to build one yourself.

It runs unmodified on any Arduino.

Tempo and  16 pattern select CV input.
8 drum mute inputs.
Run/stop input and clock/reset outputs.

You can easily add a CD4067 AMUX chip for driving an analog sequencer in parallel with the rhythm pattern.

O2 Minipops

And how does it sound?


My work on these free synthesizers is based on donations from people.
If you find the code useful, please consider a donation to keep future developments open source.

Chips for building DIY synthesizers can be found at: