This circuit is from a 90's documentation. The circuit is simple, as it uses only two transistors, and the control is done by pressure switches. The indication is done by LEDs.
This other circuit from the June 1968 Radio Electronics magazine has a driver transistor and a...
The TDA7000 is a Philips integrated circuit that contains a complete FM receiver with the need for...
Using a 4N33 optical coupler, we have in the figure an optical interface for TRTL circuits,...