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A flashlight i made out of a simple joule thief circuit, 2 ultra brite LED's, and a dead battery.
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Apr 21, 2011. 11:29 AMtwighahn
says:
wat r the directions
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Feb 24, 2011. 4:41 PMdragontirex
says:
very nice ,i made one too :D
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4
Aug 15, 2009. 6:09 PMandrew101
says:
i love joule theif. nice way to put it. what gauge of wire are you using for the coil? im using a really small gauge, and its hard to solder with. its enamled transformer wire, about 40 turns around. i guess i dont need that many if your getting such good results.
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3
Aug 16, 2009. 11:36 AMcynical_chemical (author)
says:
i think i used .35 gauge copper insulated, it is hard to solder with , thats why i used such large beads of solder .. you only need about 8-13 turns and its best to use a uncoated toroid
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Dec 11, 2010. 9:35 AMacmefixer
says:
When you use an uncoated toroid, you have to be careful that the rough ferrite surface doesn't scrape off the enamel insulation from the wire. If it does it could short out. I try to sand down rough edges on the toroid with sandpaper before I wind the wire. I really helps.
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