The circuit shown is from Motorola's 1990 Linear Databook. Components are not currently common. An equivalent can be used for the transistor.
This 1995 circuit uses interruption sensors or NC connected in series in any quantity. With the...
This circuit, suggested by a 1975 documentation, detects an electrical discharge in a storm by...
Found in an old Electronic Design, this circuit provides an output voltage that is the absolute...