Yet another frequency manipulator.
Divides F in by 2. Runs well up to around 300kHz in this simulation. It's been a long time since I've breadboarded this so I'm not sure if that's realistic.
It works with virtually any input waveform, but generally only responds to the fundamental frequency. I would actually expect it to sound like a low-fi octave fuzz with guitar. I'll have to try that.
For the most part, I have simply copied this circuit from Google image search, but I have added capacitors in parallel with each of the feedback resistors to improve high frequency performance slightly and minimize spurious state changes.
-Jason
