[SI-LIST] Re: si-list@freelists.org
- From: "Muranyi, Arpad" <arpad.muranyi@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Wed, 20 Apr 2005 10:44:17 -0700
Kevin,
In light of your warning in your last paragraph I am surprised
that you are suggesting an inductor in place of the ferrite bead.
Isn't it going to generate unwanted voltages?
Also, even if the 5T field is DC, any physical movement of the
electronics with respect to the magnetic field could be disastrous...
Arpad
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of Kevin G. Rhoads
Sent: Tuesday, April 19, 2005 6:27 AM
To: rpimenta@xxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: si-list@xxxxxxxxxxxxx
>by no means I can use the ferrite beads in such big magnetic field. =
They will saturate
>and my filter will be completely different. If any filter in the end. =
Nevertheless
>I'll place a zero Ohm in place.
You can use an air-core inductor, you won't get the loss ferrite beads =
will provide,
but you will get some inductance.
Also, be very wary of "non-magnetic" components and materials, many are =
weakly ferromagnetic,
which is normally as good as truly non-magnetic, but with extreme fields =
(such as your 5T)
it just ain't the same.
Finally, if there is any AC component to that 5T field, every circuit =
loop will have pickup in
proportion to the projection of the cross-sectional area perpendicular =
to that field. This
includes not just wiring, but also traces on boards. If you have the =
design freedom to align
your boards perpendicular to the field direction, that is a good start.
HTH
Kevin
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