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My all time favorite analog oscillator is the Twin-T (the one with a BJT) [1]

It was hard to get a proper intuition of how and why it works, but when you finally do ... fireworks!

Another thing that's real fun with oscillators is to try and build a true chaotic oscillator, but only with R+C+BJT

Not easy, but can be done [2]

[1] https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj...

[2] https://www.instructables.com/A-Simple-Chaos-Generator/


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