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Usual transformer cores are either E-I or E-E. What's the reason for Flyback's being only C-I? Does it simply cut the cost?? I want to know if it would perform less if it were an E-I.

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  • \$\begingroup\$ Flybacks are commonly EI - please explain why you think otherwise? \$\endgroup\$
    – Andy aka
    Apr 21, 2015 at 14:55

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Assuming you're talking about an old-school CRT flyback transformer and not a common switchmode flyback transformer (which are generally not C-I), I think that it's a cost optimization based on all the insulation required for reliable operation at high voltage- since the secondary coil is bulky relative to the amount of copper, a lot of ferrite material is required to make a closed magnetic circuit that clears the coil, so it's cheaper (less total volume of ferrite) to have only one leg closing the magnetic circuit.

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