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 small amplifier with a low impedance microphone that can be used for hearing aid was found in a...
We found this circuit in an old American documentation. The table gives the values of the...
Found in an old English publication this circuit uses a dual gate MOSFET. Coils not specified....