We found this receiver on a single chip in the 1976 Siemens integrated circuits manual. The circuit is of the super heterodyne type using ceramic filter in the IF.
Found in a 90s Popular Electronics, this circuit checks if a remote-control transmitter is...
This circuit for a decorative robot was found in the April 1988 Radio Electronics magazine. The...
This siren circuit was found in a Popular Electronics from March/April 1969. We can easily...