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I needed a pocket sized iPod charger. You know, in case of an emergency. First I started with a proof of concept. I connected a 9V battery to a 5V regulator. I cut out a USB socket from a computer PCI card that I had. Finally, I mounted it in a project box from Radio Shack. Works like a charm.

I then decided to try the Altoids Tin charger that everyone (as it would seem) on the Internet has built. I found a cool circuit that was basically the same as mine, but included a current regulator to keep the output at less that 1 Amp. (See image below.)

Now, you can buy these devices at any electronics store. I’ve seen the 9V versions go as much as $20. Not to mention the 40+ hour jobs that are in the $60 range. It’s not about being cheap, it’s about Doing It Yourself!