This circuit uses a diode as a radiation sensor. The operational ones are old because the publication is from the 80's, but modern low voltage equivalents can be tested.
This circuit was obtained in a 1970 EEE and applies to almost any operational amplifier. The...
The circuit shown in the figure generates a square signal (50% active cycle) when the pressure switch...
We found this transistorized AM receiver of the regenerative type of excellent quality in a...