This converter has coils according to the reception and converted frequency bands. We found it in the October 1989 Radio Electronics magazine in an article that teaches its construction.
Found in a 1990s Motorola documentation, this high voltage circuit uses a PUT that is not a common...
This circuit was found in a Popular Electronics from the 90s. The frequency range generated...
This circuit was found in a 1963 magazine, but can still be easily assembled with some current...