This circuit without sensors in series triggering an SCR was found in volume 5 of the 1995 Encyclopedia of Electronic Circuits. The circuit can have the number of sensors changed.
This circuit was found in the July 1992 Radio Electronics magazine. Sensitivity adjustment is made...
This circuit was found in a 1967 Electronics World. We can design it with a BF245 for the FET and a...
Using a CA3030, this circuit was found in the May 1988 Radio Electronics magazine. The power...