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.
We found this circuit in an old publication. The components used are rare today. Accuracy depends on...
This TTL circuit has a well-known configuration, having been found in a Radio Electronics magazine...
The circuit shown in the figure was suggested by National Semiconductor in its 1994 Linear...