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 version of the automotive tachometer in a 1980s publication. Variations from other...
This simple circuit uses a 200 µA galvanometer to measure voltages in three ranges. The circuit...
The purpose of this circuit is to amplify the signal of a phone pickup and to be able to reproduce the...