Hi,
On Sun, 15 Feb 2026, at 11:24, Thomas Hudson via Synth-diy wrote:
I’m looking for drone synth ideas, whether fully analog or very hands on controllers for something running on a Raspberry Pi, like Super Collider, Sonic Pi, or ChucK. Just looking for ideas to get started
there’s a LOT of riffing on the old “CD40106 and 6 pots” idea out there, including (without checking, but a fairly confident guess) the example you shared in your post.
You might also like to look at Nonlinearcircuits’ “Divide and Conquer” circuit.
You should be able to replicate and explore the idea in software with whatever the kids are using these days — Puredata, Max, Strudel, etc
I have an older Eurorack version of it and you can pry it from my cold dead hands.
Paraphrasing Andrew@NLC’s own description: feed it two rectangle waves at almost-but-not-quite the same frequency and enjoy a constantly-shifting ocean of harmonics. Then filter/EQ to taste, and also adjust pulse width of the source oscillators, and the mix levels of the divider outputs.
Good way to add some sparkle and fizz.
John