So I have a slightly strange project, and I'm a total beginner with this stuff, so bear with me if I'm asking stupid questions! I have a power source that generates 6V~3W, but that power varies because it doesn't generate constantly (it's a hub on a bicycle, so the faster you go, the more it generates, and it doesn't, so far as I know have regulator, as that part is usually in the lights), and I want to bring it down to 5V 500mA to power a gps that gets its power from a USB. So there's the project. I think I need some sort of diode to bring the voltage down, but I also need something to smooth it out, which would be some kind of cap, wouldn't it? Like I said, my grasp on all of this is way too loose, but I do hope to understand it better soon. Thanks much, and I'll try to provide any extra information that might be useful, if it's needed, but right now, that's about all I can think of.
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