Using the name of varactor this circuit was found in the Radio Electronics magazine of July 1982. Varicaps of any type can be used and the components selected according to the component.
This receiver for listening to the TR-23 phone was manufactured in Japan in the 1960s. The circuit is...
The two previous circuits show the INA185 a current sensing amplifier in basic applications. This...
This small digital transmitter uses a 1 MHz crystal, or another nearby frequency, to produce a...