This circuit was found in an ancient American documentation. With it is possible to double the frequency of a transmitter For the range of 6 meters obtaining 8 W. The circuit makes use of varicap.
This oscillator can produce 2 to 10 MHz signals depending on the coils used. The transistors can...
The transistors in this circuit can be the BC548. Capacitors determine the frequency and can be...
This circuit acts on a relay disconnecting the load when the input voltage exceeds the set limit....