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.
In this circuit the photo-transistor signal is amplified by a Darlington step and then applied to a...
This traditional detector configuration is from an old publication where the MC1555 is the...
We found this circuit in the October 1987 Radio Electronics magazine. The circuit uses an...