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 buffered version of the previous circuit appeared in an article in the September 1989 Radio...
This circuit consists of an improved version of the CIR5892, using two transistors and adjusting the...
This circuit was found in a 1977 Signetics manual. The 556 consists of a 555 double and the...