This FM advertising suppressor (SCA) decoder circuit was suggested by Signetics in a 1980s documentation. The circuitry decodes the 67 kHz signal. The integrated circuit used is of the time.
We found this circuit in a Popular Electronics from 1992. The circuit shows how to use a variac in a...
The selected circuit generates short duration pulses at a frequency determined by R1 and C1. The...
It is an ideal assembly to be implemented as work by students of digital electronics courses, as...