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I know there are plenty of USB chargers out there for you to build. But here’s one that doesn’t use a voltage regulator or an IC chip to power it. The basic concept is to use 4 – AAA rechargeable batteries (1.2V a piece) to power the USB and a couple of solar cells to charge the batteries. If you’ve done the basic math you’re probably wondering how 4.8V (4 x 1.2) is going to power a USB device which requires 5VDC. Well that’s actually how I came up with the idea. Continue Reading…

Aurora mini 18 LED Project

December 3, 2011 — 1 Comment

My obsession of this year is full-color LED. I have made Aurora 9×18 as a result. As much as I love the scale of Aurora 9×18, I also wanted to have something smaller, perhaps something that can go on a costume?
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