No B-EMF bi-toroid transformer Part 3

Hi there,

Here i try to couple the primary coil core physically to the main core, to see if this increases efficiency of the system.

It is based on the Thane Heins Bi-Toroid transformer. It seems to have NO back coupling from the secondary coil to the primary coil.

So no B-EMF force to be overcome in the primary coil.

Still thinking of ways to increase efficiency here.
So any ideas? Let me know.

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