Tribute to Craig Anderton 6: Bass OD PUBLIC

Bass Overdrive with Compression and 3-Band Tone

Bass overdrive with compression and 3-band tone. Controls Include: Input type switch (Direct or Line), Compression, Gain 1, Drive, Bass, Mid, Treble, Gain 2, and Volume. Frequency Range at or above 0 dBV is from 6 Hz to 2.5 kHz, with all controls at 50%. Suitable for 4/5/6-string bass or 8-string guitar. [Not recommended for 6/7-string guitar.] Maximum Gain = +32.3 dBV @ 100 Hz with all controls at 50%, or up to twice that with all controls at 100%. With specified IC, the circuit should function as a clean overdrive regardless of gain settings. However, the circuit is designed specifically for signals taken directly from passive bass-guitars. For active input-signal sources, high input levels may increase electronic noise amplified by the compressor. The Compression and Gain stages were designed by Craig Anderton. The Output Stage is a well-known active Baxandall-type tone-control circuit with a midrange control added. Power-supply not shown. Requires a regulated dual-polarity DC supply providing +-9VDC or +-12VDC or +-15VDC or +-18VDC at >= 40 mA of current. [Note: Higher supply voltages result in lower op-amp noise.] And though simulator verified, treat the circuit as experimental. Breadboard test before committing to a soldered build. House completed project in a grounded metal enclosure.