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Guitar Preamp with 2-Band Tone, Fuzz, and Boost.

Guitar preamp circuit with bass & treble plus fuzz and boost. Uses 3 dual op-amp ICs. Features Input Buffer, Gain Stage, 2-band active James-style tone-control circuit, Boost circuit, and Fuzz effect using soft-clipping Schottky diodes. All subcircuits except the tone-controls are based on designs by Craig Anderton, though with significant modifications. Controls Include: Master Drive, Direct Level, Tone enable switch, Tone Drive, Bass, Treble, Tone Level, Boost enable switch, Boost Gain, Fuzz enable switch, and Volume. Range at or above 0 dBV is from 25 Hz to 16 kHz, with emphasis on mids. Suitable for 6/7/8-string guitar or 4/5/6-string bass. Maximum gain = +21.6 dBV @ 250 Hz with all controls at 50%, or +66.8 dBV @ 160 Hz with all controls at 100%. Note: Dominant frequency shifts lower as total circuit gain increases. With all controls at 50%, the Tone controls enabled, but Boost off, maximum gain = +24.8 dBV @ 630 Hz. With all controls at 50% and both Tone and Boost on, maximum gain = +30.9 dBV @ 630 Hz, qualifying the circuit to serve as an overdrive. Power-supply not shown. Requires regulated dual-polarity DC supply providing +-9VDC, +-12VDC, or +-15VDC at >= 60 mA of current. And while simulator verified, treat the circuit as experimental in nature. Breadboard test it before committing to a soldered build.