Extreme Op-Amp Distortion PUBLIC

Extreme Op-Amp Distortion Circuit with 2-Band Tone for Guitar

Extreme op-amp distortion circuit for 6-string electric guitar, with 2-band tone and extra buffered output. Controls Include: Clean Drive, Clean Gain, Clean Level, Distortion Gain 1, Distortion Drive, Distortion Gain 2, Distortion Level, Bass, Mid Center, Treble, and master Volume. Frequency Range at or above 0 dBV is from 50 Hz to 7.5 kHz with all controls at 50%, although bandwidth increases with controls set > 50%. Suitable for 6/7-string electric guitar. [Not recommended for 8-string guitar or bass-guitar.] The range between low and high -3 dB corners is from 40 Hz to 10 kHz. Maximum gain = +16.5 dBV (Vo/Vi = 6.7) @ 1 kHz with all controls at 50%, or +51.5 dBV (Vo/Vi = 376) @ 2.5 kHz with all controls at 100%. The Treble control will boost 10 kHz from -3 dBV to +2.7 dBV or cut it to -13.3 dBV. The Bass control will boost 100 Hz from +15.2 dBV to +19.5 dBV or cut it to +6.2 dBV. The Center control does not affect gain but shifts the center of the midrange passband higher or lower in frequency. Power-supply not shown. Requires a regulated dual-polarity DC supply providing +-9VDC or +-12VDC or +-15VDC at >= 60 mA of current. And though simulator verified, treat the circuit at experimental. Breadboard test before soldering. Notes: IC2 and IC3 were chosen to provide distortion when overdriven, with distortion close to that produced by a 12AX7 preamp tube. For other distortion sounds, keep IC1 as is but substitute IC2 or IC3 with the following. For JFET distortion, use a TL082CP. For MOSFET distortion, use an OPA2156IDR.