This converter converts a signal in the 200 kHz to 3.8 MHz band into frequency signals that can be tuned on a 3.5 MHz receiver. Coil data not provided.
Suggested by Amperex in 1968, this circuit is intended for hearing aids. The integrated circuit...
We found this circuit in a Poptronics of February 2000. We can do its assembly using 4 1N4001...
Found in an English documentation from 1982, this circuit can be changed to operate in a different...