Electronic Night Light

 by TinkerJim
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Step 9:

Still another one of our night lights (this one is kept at the top of the loft stairs) has a jumbo white LED mounted near the top cover and angled downward. This spotlights the main image on the night light bottle and also brightens up its lower reaches.
 
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richardcole says: Jan 22, 2011. 1:45 PM
can u tell me why this circuit use for one led and simple battery is could be only make by battery and led why Circuit use i watch u guys make circuit ... can u tell me why circuit need for this type even very simple look...
TinkerJim (author) in reply to richardcoleJan 23, 2011. 7:06 PM
A white LED needs over 3V to operate, so one battery won't do it. Moreover, the circuit will keep lighting the LED until the battery voltage drops down to around half a volt.
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