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 oscillator, from a 1978 amateur radio manual, can oscillate in frequencies from 2 to 22 MHz...
The purpose of this circuit is to determine from the position of the float which of the pumps...
This circuit uses two operational amplifiers, which can be of the type 741, in a full wave...