This is $20, opamp Gain Treble Bass. just add your fave clipping element, such as a FET, MOSFET, CD4049, NPN Ge, whatever. Add a master volume. Plastic case, so a lunchtime project. Just put something between the jack and PCB, some copper foil shielding. The PCB is small, plenty of room.
Or use it as a booster .
Rotary switch for FET/Ge/4049/Mosfet.
Behringer Preamp Booster
- frank.clarke
- Breadboard Brother