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 space mark demodulator for FSK signals was found in an American telecommunication...
This circuit changes the wave shape of a square signal according the values of C1 and R1. Other...
S-meter is a signal strength meter used in radio transmission. Also known as Strength meter, in this...