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 was found in an old publicatio n from the year 1958. The circuit controls an external load by...
The focused circuit was found in the National Semiconductor's Linear Applications Handbook of...
If there is an indispensable household appliance in our kitchen these days it is the microwave...