This circuit uses a contactor having been found in a 1987 publication. More modern equivalent devices may be used. The circuit has neon indicator lamps.
This shield circuit is suggested by Motorola, using a 4N26 type coupler and an MC1733 type...
This circuit without sensors in series triggering an SCR was found in volume 5 of the 1995...
Found in the 1991 Electronics Experimenter Handbook magazine, this circuit has good power and is...