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 is a typical circuit of a PROM programmer from the 70s. It appeared in the magazine Radio...
This circuit is from a 1973 documentation, using germanium transistors common at the time. The...
This 100 second timer was found in the September 1992 issue of Radio Electronics magazine. The...