Spring Reverb Circuit PUBLIC

3-Spring Reverb Circuit for Electric Guitar

High-gain spring reverb circuit for electric guitar using the 3-spring Accutronics 8AB2D1A reverb tank, driven by an LM1875T 20-watt audio power op-amp IC. Also uses two OPA2134PA dual FET-input op-amp ICs for gain and summing functions. No tone-controls. Actual Circuit Controls Include: Input Gain, Clean Send, Reverb Drive, Reverb Intensity, Reverb Send, Output Gain, and Volume. Range at or above 0 dBV is from 24 Hz to 16 kHz. Suitable for 6/7/8-string guitar or 4/5/6-string bass, in standard tuning. Recommend rack-mount application. Maximum gain = +34.7 dBV (Vo/Vi = 54.3) @ 250 Hz with all controls at 50%, or +56.6 dBV (Vo/Vi = 676) @ 160 Hz with all controls at 100%. Note emphasis on lows between 100 Hz and 1 kHz. Power-supplies not shown. Requires one regulated dual-polarity +-15V DC supply and one regulated dual-polarity +-18V DC supply, together providing up to 150 mA of current. And while simulator verified, treat the circuit as experimental. Breadboard test before soldering.