Originally posted by Cadman
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I hear you. Not much of a magnetic circuit with so much path thru air and associated high reluctance. You might consider adding back iron. Thinking like an E core with center leg near middle coil and two end legs up against outside ends of primary cores. Use cross section area of E equal to that of coil cores. I think something like that could direct a lot of the dense flux (red area) thru the secondary wires.
Regards,
bi
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