We found this circuit in a Radio Electronics from October 1976. The components are still common, but the circuit applies to older car models with contact breaker ignition.
Found in a QST from the 90's this circuit is suitable for the medium and short-wave range. |...
This selective filter can be used with the previous receiver (CB19446E) in a simple remote-control system....
This circuit is from Motorola's Linear Interface ICs from 1993. The MC1723 is the equivalent of...