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Nice instructable!Some 5V memory backup supercapacitors have a large internal resistance, so CB capacitor might increase LED brightness. I think 47uF would be good.That supercapacitor might not have an infinite life. I have seen some Elna and other brands of supercapacitors leaking. One reliable brand is Tokin/ Nec. I have collected about 40 of them from different equipment. I have never seen one going bad, the oldest ones i have are two 5V and 0.47F from 1980s. They are pretty big, 15mm x 35mm.
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