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Old 15th Dec 2020, 4:24 pm   #2
Nickthedentist
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Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,844
Default Re: Advice on mains current sensing, safely

There are cheap, ready-made devices which do this. Although I like a challenge, I think I'd just buy one off-the-shelf.

Quick Google search... Not technically entirely passive, but: https://www.amazon.co.uk/Energy-Powe.../dp/B00VKU57D4

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