Highly-Modified MXR Distortion+ Circuit PUBLIC

Highly-Modified MXR Distortion+ Circuit

Highly-modified MXR Distortion+ circuit, featuring Fender-style 3-band tone-stack with customized part-values. Controls include: Input Gain, Drive, Fuzz enable switch, Fuzz Symmetry Switches (SSW), Fuzz Depth, High Trim, Low Trim, Bass, Mid, Treble, and Volume. Primary modifications are; two gain stages instead of one, addition of the tone-stack, High Trim, and Low Trim controls, use oi Schottky diodes instead of standard silicon or germanium types, adjustment of component values to optimize response, and the relabeling of controls. Range > 0 dBV is from 14.5 Hz to 13.5 kHz. Circuit is good for 6/7/8-string guitar or 4/5/6-string bass, with emphasis on mids, but is recommended for the 6-string electric guitar in standard tuning. Maximum gain = +27.9 dBV (Vo/Vi = 24.8) between 100 and 250 Hz with all controls at 50%, or +59.2 dBV (Vo/Vi = 912) with the Gain controls at 100% but all other controls at 50%. Do not set all controls at 100% except as a worst-case test during breadboarding. The circuit can be the basis of either a stomp-box or rack-mount project. The battery can be replaced by a regulated single-polarity +9V DC power-supply providing >= 20 mA of current. Though verified, treat as experimental. Breadboard test before committing to a soldered build. And house completed project in a grounded metal enclosure.