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 automation control circuit uses two relays to control 4 loads using just one switch. The...
This circuit is used to test an inductor (coil) allowing the observation of its opration in an R-L...
This circuit found in a 1965 Electronic Design multiplies the frequency of a 400 Hz signal...