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 shield circuit can serve as a basis for a digital mixer or simply for a switch without noise...
This simple unregulated half-wave font was found in old American documentation. The diode is...
This circuit has an action opposed to the previous one, being activated when the light falls on...