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.
Found in Popular Electronics this circuit will trigger a buzzer if the ignition key is removed...
Found in Popular Electronics, this sophisticated short-wave receiver requires a lot of skill from...
This circuit is from an old American documentation using LEDs in the rectification. The circuit...