This circuit makes use of comparators and common operational amplifiers, having been found in Motorola Linear Interface ICs of 1993. The circuit requires symmetrical source.
This is one of the many hysteresis comparator circuits the reader may find in this section and on this...
This circuit is from a Radio Electronics from February 1971. The SCR is load controlled and the...
Found a documentation on PCs from 1996, this circuit can be used as a shield. The relay is rated at...