Weekend Projects - Vampire Flashlight

From the creator

Complete instructions for this episode of Weekend Projects can be found at http://makezine.com/projects/vampire-flashlight/ 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.

Published 2014-06-05 · Watch on YouTube ↗
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