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.
Found in documentation from the 1980s, this circuit can be used with other operational ones. The...
This circuit is from an old publication from 1977 and can be implemented with more modern...
This control for a small servomotor with a current of a few hundred milliamps was found in an...