A Very Groovy Steggo - Cloning the Uni-Vibe

The Shin-ei Uni-Vibe is a very early chorus / vibrato pedal first sold in the 1960's. It has been used by many legendary guitarists including Jimi Hendrix, Robin Trower, and David Gilmour. It was marketed as "Vibra-Chorus" the Uni-Vibe uses a series of phasing filters connected to light dependent resistors (LDRs). The LDRs themselves are modulated by a small light bulb whose intensity and rate of pulsation are controllable using the knobs on the effect itself. I'd wanted to do a Uni-Vibe clone for ages, and the PedalPCB board looked very approachable, so I took the plunge!