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.
This circuit is from a Popular Electronics from 1993. The magazine is no longer printed, but the...
Found in a Popular Electronics from the 90s, this circuit can be adapted to use LEDs. The power...
This sensitive medium wave (MW) radio pick up the local station without the need of an external...