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Build your own Gaussmeter - Magnet Man - Cool Experiments with Magnets
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日期：2026-04-23
First, you need a 9v battery. You can get them most anywhere. Next is a battery clip to connect to the top of the battery. You get a package of 5 for $1.39. The 7805 is a +5v regulator which takes the +9v from the battery and reduces it to +5v which the H...看更多
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