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Thanks for your comments. I will review the instructable and write in a section on power management. The USB cable is hacked to take a feed from +5V and Ground from USB to the power board with the capacitor on as taking it straight from the Arduino was never an option. I ran tests on the code and animation I wrote and the pull never exceeded 0.5A. You're dead right, if you run every LED at full brightness, that 60ma per LED, it soon adds up and 3A power supply would be required. However, I used a USB power meter while I wrote the code to ensure I didn't have silly power requirements. I'll knock together a schematic when I get a minute and update.
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