Permanent magnets as coil cores?

From: vinhkan <markrrivet@xxxxxxxxxxx>
Date: Mon, 12 May 2008 15:43:59 GMT

What are the benefits of using a permanent magnet for a coil core.
I recently came across a design for a switching power supply that used
magnets as cores for the inductor. I have never heard of such a thing,
except maybe in speakers.
.

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