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DigiTech Bad Monkey Overdrive
Schematic is avaiable HERE. And a requested layout without input and output buffers
Throbak Overdrive Boost
Per request. A modified Colorsound Overdriver circuit with some bells and whistles. The most noticable one is the Ge switch which toggles in a germanium diode and a germanium transistor for hard clipping. Schematic is avaiable HERE.
Memphis Tremolo Modulator
Schematic is avaiable HERE. Hmm, looks interesting, sort of a one stage J FET phaser?
Colorsound Vocalizer
A rare bird in the Colorsound range. Some additional mods can be made. Replace the 3,9k resistor with a 10k pot for a Freq control. And try a PNP Germanium for Q1 which smoothens the feel of the formant filter.. Schematic is avaiable HERE.