19th January, 2005, 03:31 PM
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 | AOA Front Page Managing Editor in Chief | | Join Date: March 2003 Location: Great Britain
Posts: 15,901
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| It might be caused by resonance on those copper coils. To see if it is, just carefully place your finger on the coil whilst you can hear the noise and see if it stops when you touch it.
If it is that you can stop it by placing some card in the coils.
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