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 XR2208 application circuit was found in the April 1978 Radio Electronics magazine. The...
This circuit is from an old Elektor using components that are not currently common. The circuit is...
This 16-bit circuit was found in a 2005 Linear Technology application manual. The circuit uses...