Updated Tutorial: Minty Boost @ Adafruit Learning System.
This project details a small & simple, but very powerful USB charger for your mp3 player, camera, cell phone, and just about any other gadget you can plug into a USB port to charge! (See below for compatibility tests.)
The charger circuitry and 2 AA batteries fit into an Altoids gum tin, and will run your iPod for hours! 2.5x more than you’d get from a 9V USB charger! (See Process for math/calculations) You can use rechargable batteries too.
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