What’s the simplest audio frequency oscillator you can imagine? There’s the 555, of course, and we can think of a few designs using just two transistors or even a few with just one. But how about an oscillator with no active components? Now there’s a neat trick.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/04/23/no-active-components-in-this-mysterious-audio-oscillator/