This is the traditional audio preamp configuration with the National Semiconductor LM382. The circuit has good gain and can be used with magnetic pickups or from signals from an auxiliary input.
Found in a 1966 American publication, this circuit invert the phase of a low frequency signal. The...
This circuit provides two slightly different audio signal outputs from a monophonic audio signal, so...
This circuit, from a 2006 documentation, automatically controls the activation of a water pump, and...