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 circuit was obtained in a Motorola documentation from 1966. The circuit can use a common FET...
This passive tuned circuit was found in a 90s Popular Electronics. The coils must be according to the...
The circuit shown was found in a Japanese publication from the 1960s. Transistors can be...