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USEFUL CIRCUITS 13. Twilight switch.
Instructions for building and operating a circuit breaker that is switched on or off according to the light level. These circuits are usually used to automate public lighting and this time we'll provide a model (a Bethlehem) of automatic day / night illumination.
This twilight switch can be used to turn on lights with a power of a few mW or to turn on powerful lights for several KW, it will depend on what power the contacts of the relay used will support, but usually it is around 2000w-2400w. If a relay with 4 contacts is used the power will be quadruple.
The fundamental component in this circuit is the photoresist or LDR whose resistance varies in a very wide range according to the light received. The video analyzes its behavior.
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