Light detector switch

Posted on Feb 5, 2014

Anyone know how I could make an led come on when it gets dark automatically?I made a version with a relay and photoresistor that worked but then I was think won`t that drain the battery to much?I`m trying to use this in conjunction with a circuit I got from here like the Brinkmann and it uses only 2 aa batteries. I found some info on the web talking about using a transistor as an on and off switch but my only electronic experience is what I have learned from Mr.Als course.So it`s still..

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