Single-Battery Preamp 2 PUBLIC

Guitar preamp powered by a single 9-volt battery, with two Gain controls, Drive control, Volume control, and 2-band tone.

Guitar preamp powered by a single 9V battery. Controls Include: Input Attenuation enable switch (Attenuate or Direct), Attenuation control, Gain 1 and Gain 2, Drive, Bass, Treble, and Volume. Range is from 40 Hz to 6 kHz. Suitable for 6/7-string guitar or 4-string bass. Maximum Gain 16.5 dBV @ 500 Hz with controls at 50%. Circuit will work for tone-shaping with moderate boost. For sufficient gain to use as an overdrive, change the tone-control's feedback resistor R18 as follows. 470k gives 27 dBV max gain, for minimum overdrive. 1M gives 34 dBV max gain, for medium overdrive. 2.2M gives 40dBV max gain, for extreme overdrive. [Do not exceed 40dBV max gain.]