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Old 8th Dec 2017, 12:31 am   #2
Herald1360
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Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 11,969
Default Re: De-magnetising Tools

I believe you need to stick them in the bore of a reasonable sized solenoid, then feed the coil with an AC supply you can wind up and down slowly. A Variac feeding a suitably rated transformer will do. Wind it up, then wind it back to zero slowly.
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