Found in a publication by Gernsback from 1960, this circuit uses germanium transistors of the time and commercial coils. It can be changed to operate with modern transistors and other wavebands.
Found in an EDN from the 80's, this circuit makes use of an operational one of the time. The...
This circuit is from the 80's, using an integrated of the time. The circuit serves as a reference,...
The circuit presented is from the Linear Applications Handbook of the National Semiconductor of...