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non contact electrical tester for detecting phase and null

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elec1363

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hi.
i want to make non contact electrical tester that can indicate ohase and null.
i mean if i put it near to a phase the led go on but near the null nothing happen.
anyone can help me?
 

CMOS

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Re: non contact electrical tester for detecting phase and nu

Check this
**broken link removed**
 

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