Guitar treble boost

  
Ql is connected as an emitter follower in order to present a high input impedance to the guitar. C2, being a relatively low capacitance, cuts out most of the bass, and C3 with RV1 acts as a simple tone control to cut the treble, and hence the amount of treble boost can be altered.
Guitar treble boost  - schematic

Q2 is a simple preamp to recover signal losses in C2, C3, and RV1.




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