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 found in American documentation from the 90s. The coupler is the type that uses a...
Incandescent lamps of up to a few amps can be placed to flash with this circuit. The frequency depends...
This circuit is used to detect the water level in a reservoir. It triggers the charge when the...