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.
Other voltage comparators can be used in this circuit that we found in a Popular Electronics from...
Published in a February 1978 Radio Electronics magazine article, this digital circuit uses some of...
This circuit was obtained in an English magazine from 1980, but it can be easily assembled today....