I’ve been tinkering around with this circuit on my breadboard. It’s the Fuzz Unit from Music Projects by R.A. Penfold, 1994.
Two parallel signal paths, a clipping style fuzz and an adjustable gain stage, are both fed into a voltage controlled amplifier (VCA). The fuzz goes to the VCA’s input and the gain stage goes to the VCA’s control pin.
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You can find details about this project at Viva Analog. I went a little further by adding an envelope follower (based roughly on the envelope follower in the Lovetone Meatball) and a CV input that allows you to insert an external modulation source (ie. external LFO, sequencer, CV foot pedal, etc…).
My revised schematic and some sound clips are below… Continue reading →