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It isn't strictly needed, but yes it's for a motor and if there's a way to get more power for the weight... I'll take it. Wouldn't you?
There's an obvious way: turn the supply into AC and then use a transformer. But that's horrible for weight. A joule-thief style arrangement might quite a bit lighter.
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I have 4 x 4700uF 63v caps if those are any use. They're not suitable for my voltage booster circuit, but someone else might find them handy... would like to hang on to 1 of them, but if you really need 4, would part with it.
