A small op-amp preamp that sits between the Volume pot and the jack without touching the guitar's wiring: it isolates the cable from the humbuckers, adds up to 7.7 dB of boost on a trimmer, and a 3PDT switch turns it into true bypass with zero current. A 32×20 mm SMD and a 48×28 mm THT version, ngspice simulations and a wiring diagram.
$ ls tags/preamp
#preamp
1 posts