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 1964 magazine, but it can be easily assembled today, as the...
This circuit turns off a load after an interval of 8 to 80 seconds adjusted on the potentiometer. The...
We have already explored this configuration in several of our projects. It is equivalent to a...