RS-Timbre "3VOA Distortion" PUBLIC

3-Voiced Op-Amp Distortion Circuit

RS-Timbre "3VOA Distortion" circuit. Overdrive with 3 distortion voices generated by different overdriven op-amps; JFET-input, CMOS (i.e., MOSFET-input, BJT-output), and completely BJT. The Input and Output stage use a high-fidelity op-amp to ensure quiet operation of those stages regardless of control settings. The other ICs will produce more noise when overdriven. The three Distortion signals have separate Level controls, while the Direct signal's level is set by the Drive control. There are no tone controls. A tone control circuit should be used before or after this circuit, or both. Frequency range between low and high -3 dBV corners is from 20 Hz to 16 kHz, and between 0 dBV points from 30 Hz to 10 kHz, with all controls at 50%. Suitable for 6/7/8-string guitar or 4/5/6-string bass. Maximum gain with all controls at 50% is +27 dBV @ 400 Hz, or twice that with all controls 100%. This circuit will work for stomp-box or rackmount projects, but rackmount is recommended. Power supply not shown. Requires a regulated dual-polarity DC supply providing +-9VDC or +-12VDC or +-15VDC at >= 80 mA of current. And though simulator verified, treat the circuit is experimental. Breadboard test before committing to a soldered build.