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In Reply to: RE: power transformer design questions or call it debate . posted by grhughes on April 26, 2012 at 06:02:01
"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.
Eli D.
Follow Ups:
nt
"The gift of imagination is a gift of the Gods imparted to a few who receive innumerable kicks in the a$$ their entire life." Le Corbusier (Charles-Édouard Jeanneret)
A quick search at Mouser turned up the link provided below.
While not inexpensive, stock # 710-74277290 caught my eye. The bore of that bead is approx. 1/2 inch. Several turns of wire can go around that bead and kibosh EMI/RFI rather well. :> D
Dig around and you'll find less costly beads. Make sure to buy only rounded or chamfered parts. You don't want sharp corners nicking the wires.
Eli D.
I use balanced 240v power line input on all my amps. Thanks Ray
"The gift of imagination is a gift of the Gods imparted to a few who receive innumerable kicks in the a$$ their entire life." Le Corbusier (Charles-Édouard Jeanneret)
http://www.ebay.com/itm/Qty-4-each-2-5mH-10A-EMI-Choke-JW-Miller-Coils-Filter-/220680930554?pt=BI_Circuit_Breakers_Transformers&hash=item33619bc4fa
"The gift of imagination is a gift of the Gods imparted to a few who receive innumerable kicks in the a$$ their entire life." Le Corbusier (Charles-Édouard Jeanneret)
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