This 1967 Raytheon circuit uses a Raystor, an optical coupler with a lamp and an LDR. The circuit can be adapted to use another type of coupler.
a We find this circuit which has a traditional configuration in a 1988 publication. The circuit is...
This circuit was found in ancient American documentation. Equivalent operational amplifiers can be...
This bistable circuit that drives a relay with a pushbutton was found in the March 1pp6 issue of...