This circuit was obtained from a 1980's QST magazine. The circuit can generate 1 to 15 MHz signals with 1 Vpp at 50 ohms load. Used transistors are still common today.
We found this circuit in an old documentation for hams. In it we have the way to use a varicap to...
This fuzz guitar circuitry was found in an American documentation from the 80's. Transistors can be...
Of course, the range of this transmitter found in a 1992 documentation is not exactly 4 km, as it...