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.
You can adjust the frequency produced by a ring oscillator with three inverters inserting a...
Found in a Popular Electronics from the 90s, this digital recording circuit uses an unusual...
The purpose of this circuit is to increase the sensitivity of a galvanometer, making it possible to...