We found this circuit in the May 1989 Radio Electronics magazine. The circuit can have its values changed to operate at other frequencies and the power supply must be symmetrical.
This circuit was suggested by Motorola in 1980s documentation. The circuit employs an operational of...
We found this circuit in an English publication from 1963. The circuit uses germanium transistors of the...
This circuit is from a 1980s documentation featuring two time constants for sound decoding. The...