Extreme Distortion with 3-Band Tone PUBLIC

Extreme Distortion Circuit with 3-Band Tone

RS-Timbre "Extreme Distortion" with 3-band tone. Obtains distortion from overdriven op-amps, square-waves, and triangle-waves, mixable with the direct signal. Controls Include: Input Gain, Drive, Bass, Mid, Treble, Intensity, Tone Gain, Square-Wave Sensitivity, Square-Wave Level, Triangle-Wave Drive, Triangle-Wave Level, Direct Level, and Output Gain. The IC1 was chosen to provide clean operation of the Input and Driver Stages. IC2 was chosen for the Tone Stage and the Booster and provides CMOS distortion when overdriven. IC3 is used for the Square-Wave and Triangle-Wave Converters and provides JFET distortion when overdriven, and IC4 is a BJT device used for the Output Stage and the Output Buffer to provide very tube-like distortion when overdriven. ICs other than IC1 are noisier than IC1. To make any given section cleaner than specified (i.e., little or no op-amp distortion), use the OPA2134PA. All ICs here are pin-compatible with each other if acquired in standard 8-pin DIP packages. Frequency range at or above 0 dBV is from 100 Hz to 4 kHz with all controls at 50%, but which extends in both directions with controls set > 50%. High-gain circuit. Maximum gain = +29.4 dBV @ 630 Hz with all controls at 50%, or twice that with all controls at 100%. Power-supply not shown. Requires a regulated dual-polarity DC supply providing +-9VDC or +-12VDC or +-15VDC at >= 80 mA of current. Note: Higher supply voltages result in less op-amp noise but make the op-amps harder to overdrive. And while simulator verified, treat the circuit as experimental. Breadboard test before committing to a soldered build. And house in a grounded metal enclosure.