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.
The circuit, shown in the figure, consists of an audio oscillator that generates signals between...
This circuit was obtained from a 1978 Practical Wireless. It makes a speaker emit sound when there...
The circuit presented is from the Linear Databook of Motorola of 1990. With it we emulated a NOR gate...