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4hv.org :: Forums :: General Science and Electronics
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Magnetise/Demagnetiser - How do these passive devices demagnetise?

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IntraWinding
Wed Nov 17 2010, 02:56PM Print
IntraWinding Registered Member #2261 Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581
How do these work?
1290005670 2261 FT0 3601l


Video Demo here: Link2
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Martin King
Wed Nov 17 2010, 03:11PM
Martin King Registered Member #3040 Joined: Tue Jul 27 2010, 03:15PM
Location: South of London. UK
Posts: 237
Vague memory from something I read years ago is that the demagnetise section has alternating N-S poles.

Martin.
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radiotech
Wed Nov 17 2010, 08:51PM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
See if a small magnet on a thread twirls then passing through.
Continuous twirling will lock the thread.
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hboy007
Wed Nov 17 2010, 11:58PM
hboy007 Registered Member #1667 Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 374
I bet it uses an alternating magnetization pattern with decreasing strength towards the edges that acts as a degaussing field for each section of the screwdriver while you're pulingl it out.
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IntraWinding
Sun Nov 28 2010, 04:57PM
IntraWinding Registered Member #2261 Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581
Thanks.
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