This circuit is from an April 1991 Radio Electronics magazine. The circuit uses power MOSFETs and an integrated circuit from that time.
This simple circuit that interrupts the supply of a 12 V load in the event of an overvoltage was found in...
June 2017 - Mouser Electronics has a broad line of Cree products for use in horticulture, such as...
This circuit appears elsewhere on this site, but from different sources. Using the LM3900, we find this...