This latching light alarm was found in the 1995 Encyclopedia of Electronic Circuits Volume 5. The circuit is powered with 12 V to provide a signal to a power stage.
This circuit was found in Philips documentation from 1967. The phototransistor is from that time,...
This circuit was found in a General Electric documentation from 1966, It applies to any triac and...
This circuit consists of an improved version of the previous circuit having an additional...