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Original Message
RE: power transformer design questions or call it debate .
Posted by Eli Duttman on April 26, 2012 at 08:04:48:
"I tend to stray away from toroids as they are wide band and will pass most any trash on the power line unless they have a shield between the primary and the secondary."
Good sized ferrite beads on the primary side, with the wires looped a couple of times, suppress the power line crud. There are always tradeoffs. Toroids exhibit much lower stray magnetic fields than EI trafos exhibit.