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 shield circuit is suggested by Texas Instruments and can employ almost any optical coupler...
In the figure we have a monostable that is activated with switch S1 and pressed for an instant. The...
This circuit for alternating current was found in a 1965 General Electric documentation. The...