Tribute to Craig Anderton 5 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. Range at or above 0 dBV is from 18 Hz to 3 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 = +32.6 dBV @ 250 Hz with all controls at 50%, or +54 dBV @ 160 Hz 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 will increase noise amplified by the compressor section. 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 electronic noise. And while the subcircuits are based on proven designs, and the entire circuit is simulator verified, treat it as experimental in nature. Breadboard test before committing to a soldered build. Also, house in a grounded metal enclosure.