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Floodlight power failure self-lock switch circuit

2017-01-08 13:21  
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Floodlight power failure self-lock switch circuit
The floodlight is controlled by a ordinary stayguy switch, if it is power failure, it will be hard to differentiate whether the light is off, after it has power, the light will turn on all night, it is a waste of energy. If using this circuit to replace the ordinary stayguy switch, it will avoid this shortage, because it can beself-locked, the light will not be turned on. VTH should depend on the floodlight power, generally, it can use BCR3AM small plastic package TRIAC(3A/600V).