This circuit covers the bands from 1.8 to 150 MHz, with plug-in coils whose characteristics are given next to the diagram. The FET can be a BF245. We found it in old documentation.
The last LED on pin 1 acts as the pilot LED in this circuit from Radio Electronics magazine, June...
This dual-operator thermometer circuit was found in the September 1982 issue of Radio Electronics...
This experimental short-range transmitter uses a low-impedance microphone, low-impedance phone, or even...