This circuit produces a signal that has the waveform of the sound produced by or near the banjo. The circuit is from an 80's American documentation. The signal must come from an ordinary guitar.
IDT ZSSC3230 Capacitive Sensor Signal Conditioner Available from Mouser Electronics stock, this IDT...
We found this transmitter circuit for different frequency ranges in a 1992 documentation. The...
This crystal configuration can be made with triggers of any logic. The frequency is given by the...