This is a diagram of a 1970s reel or tape recorder. It is an Italian Geloso recorder, quite popular at the time. The circuit is a reference for equipment recovery.
This circuit uses a common multimeter on the voltage scale to measure the beta gain of a...
This simple optical alarm circuit was found in the 1991 Electronics Experimenter Handbook. The...
This circuit uses an audio output transformer found in old transistor radios. Power output is...