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.
It is a circuit that automates the lighting of a specific location (bedroom, living room, kitchen,...
This capacitive approach alarm circuit was found in a 2002 documentation. The wire to the sensor...
We found this circuit in a 1969 General Electric documentation. The circuit uses transistors of the...