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.
With the values of the components indicated, this timer controls intervals from a few seconds to a...
Using period transistors, this 10 W amplifier was found in Radio Electronics magazine from May...
The figure shows how to implement an OR function with two inputs, using a relay. The relay...