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What causes filter self-oscillation, and why does it result in a sine wave?
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What causes filter self-oscillation, and why does it result in a sine wave?

Couldn't find a straight answer to this question in my 5 minutes of Google research.

Extra credit question: why are there so few analog sine wave oscillators? In almost every major analog synth, the only way to get a sine wave is by self-oscillating the filter. Is it because this is the only way to generate a sine wave through analog circuitry, and as such it's more expensive/complex than a typical oscillator like a triangle, saw, or pulse?

submitted by /u/scottg96
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