Found in Motorola documentation from the 1970s, the circuit presented uses a component from the era that is not common today. The characteristics of the coils are given next to the diagram.
We found this transistorized circuit in a 1985 documentation. The circuit can operate with...
We found this small audio amplifier in the November 1999 issue of Electronics Now magazine. The...
This low power circuit for the FM band was found in a spy book from the 90s. The tunnel diode is...