Simple Automatic Emergency Light Circuit

Published:2011/4/27 18:40:00 Author:Christina | Keyword: Simple, Automatic Emergency Light | From:SeekIC

Here is a very simple but very useful emergency light. This device will turn on the small light automatically if the we meet power failure or fuse-cutoff. The circuit uses fewer components, andthis deviceis cheap and simple to make, so it is very suitable for home use. The circuit is as shown. When the grid is normal, 220V mains voltage is reduced by the capacitor c1, and is half-wave rectified by the diode d, the circuit has the stable DC output voltage (6v) and 90ma output current. The power supplier still supplies power to relay j, the normally close contact point j2-1 disconnects, so hl1, hl2 lost power;on the other hand, the normally open contact point j2-3 disconnects, pulse current float to the battery E.



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