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RE: " Maybe I should be looking for a toroidal transformer"

" There is absolutely no reason why someone cannot wind a toroid with the primary as a semicircle on one half of the core and the secondary on the other half "

Dave, have you ever wound a transformer like that? My experiments with this technique at RF frequencies indicate that coupling degrades and core losses increase significantly. Perhaps things are different at the mains frequency, or maybe I did something wrong. I tried it only on one occasion using various cores and several hundred watts of RF. I quickly abandoned the idea in favor of isolating the primary and secondary using an insulating layer of fiberglass tape between them.








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