And so far it works... It is a Wein Bridge circuit. I don't know exactly what that means, but it is based on feedback in an op-amp, and and instead of a thermistor, a small lightbulb is used to stabilize the feedback. Charming solution, I think... I'm using one of the most crappy opamps, the LM741. It is old and noisy but even with this one the waveform seems quite OK.
And the spectrum analyzis confirms it. It's actually very pure!
... and clean up the breadboard... I always make a mess...
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