Varactor diodes are our varicaps of today. This circuit for switching signals in an RF circuit was found in a Radio Electronics magazine from July 1982.
We found this configuration of band rejector filter or band rejector with operational 741 in a...
The circuit shown charges Nicad batteries from the bicycle dynamo and provides constant energy for a...
This circuit requires an input current of only 20 fA (femto amps) which corresponds to a...