With this passive circuit it is possible to modulated in amplitude a low intensity RF signal. The circuit is from old American documentation and uses a germanium diode as its main component.
This simple circuit for a high impedance magnetic phone (500 ohms or more) has been found in a...
This configuration enables the use of low current switches or sensors to control high power loads...
We found this circuit in the 1993 Motorola Linear Interface ICs. The operational is unusual today, but...