Tribute to Craig Anderton 6 PUBLIC

Guitar Distortion Circuit Using The LM380N Power Op-Amp

Distortion circuit for guitar, blending the direct signal with the distorted signal instead of switching the distortion in an out. Uses an overdriven LM380N audio low-power power op-amp as IC2 to obtain distortion; chosen due to its reputation for producing tube-like distortion. Likewise, IC1, a TL082CP dual JFET-input op-amp IC, was selected for its pleasing overdriven distortion. The Distort Circuit was designed by Craig Anderton. The Input and Output Stages were designed by Kurtus Richter. And the Tone-Stack was designed by Leo Fender. Drawing and concept by Kurtus Richter. Controls Include: Input Gain, Direct Send, Bass, Mid, Treble, Stack Sum, Distort Drive, Distort Trim, Output Trim, and Volume. Range at or above 0 dBV is from 20 Hz to > 20 kHz. Suitable for 6/7/8-string guitar or 4/5/6-string bass, in standard tuning. Example gains with all controls at 50% are: +12.3 dBV (Vo/Vi = 4.1) @ 63 Hz, +10.1 dBV (Vo/Vi = 3.2) @ 1 kHz, and +0.8 dBV (Vo/Vi = 3.1) @ 10 kHz. Example gains with all controls at 100% are: +36.8 dBV (Vo/Vi = 62.2) @ 63 Hz, +35.2 dBV (Vo/Vi = 57.5) @ 100 Hz, +31.3 dBV (Vo/Vi = 36.7) @ 1 kHz, and +48.6 dBV (Vo/Vi= 269) @ 10 kHz. Ideal for stomp-box applications. The battery can be replaced by a regulated single-polarity +9VDC power-supply providing >= 40 mA of current. And while subcircuits are based on proven designs, with the overall circuit simulator verified, treat it as experimental in nature. Breadboard test it before committing to a soldered build. House in a grounded metal enclosure.