EI VS C-Core for PP transformer question

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2wice

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I'm trying to understand transformer design and have been reading like crazy the past month.

But it seems for every designer or theorist there is a different reason for one to be preferred above the other.

C-Core more efficient, but performs best at full volume and you can't modify the saturation other than using more mass?

EI is cheaper can be tuned by stacking the lamination in patterns to modify the airgap to change saturation, but is leaky and losses presents as heat?

And then you can mitigate the negatives of both of those design by just changing the stacked windings or using split bobbins with serial and/or parallel primary and secondary windings.

Can anyone explain it like I'm 5 please?
 
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