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 American documentation from the 1990s, this circuit causes the fuse to blow in the event...
This circuit can function as a light alarm by changing the sound when light falls on the sensor....
This hybrid audio amplifier from National Semiconductor was found in the June 1994 issue of...