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From: Ken Smith
Subject: Re: Magnetically Shielded Inductors
Date: Fri, 27 Sep 2002 14:49:34 +0000 (UTC)
Organization: a2i network
NNTP-Posting-Date: Fri, 27 Sep 2002 14:49:34 +0000 (UTC)
In article ,
Bill Sloman wrote:
>Toroids should be better. A toroidal coil has no external magnetic field,
>even if you leave out the toroidal core. Real toroidal coils are rarely
>perfectly uniform toroids so there is usually some external magnetic field,
>but not a lot.
Even a perfectly uniformly wound single layer toroid will have the an
external field. If you hold the toroid so that you are looking through
the hole and observe where the wire goes, you will see that there is one
turn the size of the toroid. This can be removed by making it a 2 layer
toroid with the second layer progressing along the core in the other
I have also found that EFD cores have fairly low external field.
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