RoG Phozer (with a twist)

Original effects with schematics, layouts and instructions, freely contributed by members or found in publications. Cannot be used for commercial purposes without the consent of the owners of the copyright.
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sharptrickster
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Post by sharptrickster »

I wondered if I could swap the LED/LDR (or opto) for a FET, mosFET or 4049 gate (inspired by the PUP phaser series).

Here's the original: http://www.runoffgroove.com/phozer.html
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I wanted to add a buffer, and that leaves me one opamp left on a quad, so I thought: "What if I add dry non-inverted signal to the inverted filtered signal? The other frequencies should cancel out and the peaks should get "peakier", right?
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LTSpice kinda agrees:
("r" being the resistance from point A and B to GND, where the opto is originally)

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And a sweep through the "r" range:
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The thing I noticed is: The phase goes from: -90, 0, -360 to... WILD negative values.
Does it mean auto-oscilation and weird behavior?
Any suggestions on this one?
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