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.
Despite being from a 1969 publication, the transistors used have current equivalents such as BC548 and...
Found in a 1990s American technical brochure, this circuit is intended for alarms that use as...
Found in an old Electronic Design, this circuit provides an output voltage that is the absolute...