You might have seen this little creation on one of the Facebook groups already, but I figured I’d post it here too.
This module is based on a cheap Geiger counter which can be found all over the web. Every time an ionising particle is detected, the module generates a decaying pulse of variable length. This means you can use it as a random event generator, or you could play if with anyting radioactive, like a… banana?
Below is the circuit which I have piggy-backed on the Geiger counter. It cleans-up and inverts the pulses, and adds the decaying envelope. Also, it powers the counter through a 5v regulator.
High-res images and documentation of the Geiger counter can be found here: GitHub - TimMJN/Geiger-Counter-Module: Geiger counter module for analog synthesizers
Hope you enjoy!