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 Mullard circuit was found in a 1969 documentation. It uses complementary transistors on the output and...
This circuit generates signals from 0.01 Hz to 10 kHz, but uses unusual components today. The...
This filters blocks radio interference or noise coming from the AC Power line. Noise such as the...