New Project: Vampire Flashlight
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A single fully-charged AA battery is incapable of powering high-flux LEDs. However with the aid of a toroid, bipolar NPN transistor, and the popular Joule Thief circuit, you can even turn "dead" batteries into a capable flashlight power source.
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MAKE Magazine and Instructables.com's Blog
MAKE Magazine and Instructables.com isn't a Goodreads Author
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