Lighting indication light switch circuit

Published:2011/6/27 3:56:00 Author:TaoXi | Keyword: Lighting indication, light switch circuit | From:SeekIC

The lighting indication light switch circuit is as shown in the figure, when the switch S is opening, the 220V AC current is reduced and limited by the resistance R, then it adds to the two ends of the LED with the bulb E, so the LED has power to turn on. We can find the switch at night. At this point the current which flows through E is very small, it is only 2mA, we can consider that it has no power consumption, the light will not turn on. If you close the S, the bulb E can shine normally, at this time the LED turns off. If you open S, and the LED will not shine, this means that the filament of bulb E has burned off or the power grid has cut off.



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