Question

why the noise comes from tubeligt choke

Answer 1

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Answer 2

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Answer 3

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Answer 4

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Answer 5

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Answer 6

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Answer 7

the choke might have gone

Answer 8

Its a magnetic humming sound that comes due to loosely packed core laminations.

Answer 9

It's called magnetostriction, more information here: http://en.wikipedia.org/wiki/Magnetostriction