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.
September 2016 - can already be purchased at Mouser Electronics the Robot Scribbler S3 from...
This circuit is suggested by General Electric in 1966 documentation. The Triac must match the...
This circuit was found in Radio Electronics from the 90s. The circuit employs a transconductance device and...