This circuit, from an 80's publication, detects the SCA (Announcer Eliminator) signal from FM broadcasts, triggering the circuit that cuts the sound from the speakers. The signal used at the time was 67 kHz.
This circuit, from an 80's publication, detects the SCA (Announcer Eliminator) signal from FM broadcasts, triggering the circuit that cuts the sound from the speakers. The signal used at the time was 67 kHz.
