 You can buy these LED flashlights for not to much money, but why buy one when you can build it yourself? The benefit of using LED’s instead of a regular glowing lightbulb is of course its efficency where about 90% of the energy is turned into light comparead to a lighbulbs 10%. With these LED’s consuming about 90mA you should be able to use this flashlight for about 25 hours before it’s time to charge or replace the batteries.As this curcuit needs 3.3v to function there is a IC taking care of the stepping up of the voltage from 1.5 to 3.3v. And no, you can’t pop in more batteries as we’re talking a pocket flashlight here. Link: DIY Led flashlight |
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May 9th, 2006 at 4:29
how much does it cost to build though?