Crank powered USB charger?

Hello, I would like to build a simple crank powered USB charger. I have very little experience in electronics, but I think this is how I would do it:

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Any guidance concerning components types/specifics and general design would be greatly appreciated. Thanks a lot for reading!

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kiqyou_vf
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kiqyou_vf Inscribed thus:

Buy a $5 wind up torch from Walmart and modify it !

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Best Regards:
                Baron.
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baron

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