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 with germanium transistors was found in a 1980s documentation. The circuit makes use...
This Linear Technology circuit was found in a 1980s documentation. The circuit can swing up to a...
This circuit is from an Electronics World of 1968. The transistors are of the time and the power...