Found in a publication for radio amateurs from the 1980s, this circuit amplifies signals in the 60 kHz band (VLF), Winding data from the ferrite antenna are provided along with the diagram.
In fact, this circuit transmits a signal rich in harmonics without any tuning and can be picked up in a...
This circuit was obtained from an English magazine from 1985. The N414 is a complete, not easy to...
This circuit was obtained from an American publication of 1982, but can be assembled with ease...