We can burn things specially black or dark colored stuff by simple 3V battery but this will heat up the diode after intensive use. In case we need to make a Laser engraver which needs to operate over long time, Requires assembly to cool the diode down. How ever by using Joule Thief we can increase ...By: Samiran
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from Instructables: exploring - technology - robots http://ift.tt/1JasYE3
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