On Wed, 10 Aug 2011 22:42:20 -0400, "Josepi"
wrote:

No steel **wound** anything. If you wind anything through the toroid hole
current will be induced into it (eddy currents) like a nother winding and
iron will get hot. The steel all goes around the loop and the copper goes
through the doughnut hole. Laminations are created to avoid this effect by
keeping the iron "loops" as small as possible.

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"Jon Anderson" wrote in message
...
sheepish grin Well, I've never cut one apart, so didn't know. Can't
SEE any steel... G


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On 8/10/2011 6:06 PM, Michael A. Terrell wrote:
Sigh. That 'Toroid' is wound from steel tape. You can't make a
decent 50 or 60 Hz transformer without it.


High inrush current is a problem, particularly on larger torroidal
transformers