The circuit shown is from 1994 National Semiconductor documentation but can be implemented with more modern operational amplifiers. The power supply must be symmetrical.
This circuit can be used to detect the signals from the previous circuit or from any radio...
The purpose of this circuit is to maintain the polarization voltage of the base of a transistor at -1.8 V,...
This circuit is both a signal injector and a signal follower. A key selects the operating mode. The...