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.
This double-beat oscillator was found in American documentation from the 1970s. FETs admit...
With this shield circuit it is possible to control several loads up to 500 mA from the parallel port...
The original frequency of the Pierce Oscillator with bipolar transistor is given by the crystal, which...