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.
We found this circuit in the 1957 Raytheon transistor application manual. The transistor can be a...
This different alarm system, found in an old publication, uses the starter chain to protect the...
This circuit is suitable for low impedance sources, using an operational amplifier. The gain is...