RS-Timbre Distortion V1 PUBLIC

High-Gain Distortion Circuit with 3-Band Active Tone

High-gain Distortion circuit with 3-band active tone and 4 stages of gain. Controls Include: Input Gain, Driver Gain, Direct Send, Drive 1, Drive 2, Bass, Mid, Treble, and Volume. IC1, an OPA2134PA, was chosen to ensure clean gain for the first two stages, while IC2, an OPA2156IDR, was chosen to give CMOS distortion when overdriven. However, to make this a clean boost instead of a distortion unit, IC2 can instead be just another OPA2134PA. As is, frequency range is from 16 Hz to 10 kHz with all controls at 50%. Suitable for 6/7/8-string guitar or 4/5/6-string bass. Maximum gain = + 26.9 dBV @ 250 Hz, while gain at 1 kHz is +23.2 dBV, both with all controls at 50%, though both will be > twice as high with all controls at 100%. Power-supply not shown. Requires a regulated dual-polarity DC supply providing +-9VDC or +-12VDC or +-15VDC at >= 40 mA of current. Note: Higher supply voltage results in lower op-amp noise, but also makes op-amps harder to overdrive. And while simulator verified, treat the circuit as experimental. Breadboard test it before committing it to a soldered build. And house in a grounded metal enclosure.