This light activated relay circuit presented here uses the 555 timer IC and a light dependent resistor or LDR to form a light sensitive relay in an intruder alarm system or for switching on a lamp at ...
The idea was to “unite all nations by the enlightening power of physics”. But with eight months to go, Max Lippitsch's plans have succeeded only in dividing his colleagues. Lippitsch, a physicist at ...
Designed to help ultility providers push there systems harder, the SEL-421 relay combines distance and directional protection with complete control for two breakers. Breaker-and-a-half and ring-bus ...
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