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As far as using fields to measure DC current, those sensors aren't cheap, and I'm pretty sure they aren't in Digi-Key's catalog (Newark carries some, but they are a little pricey (~$75, if memory serves me correctly), and aren't allowed anyway). Now AC is a whole different story - those are easy to find. But.......... that's not really point........
Erik
(who has spent a lot of time thinking about this exact question)
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