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Coupling of pri and sec in 100:1 CST?

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cupoftea

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Hi,
We are doing a 100:1 CST using E20/10/6 former and core.
Attached A and B shows the 100 primary turns. C and D show two different ways of doing the secondary.
Please can you conform that C and D have the same coupling as each other, between pri and sec?

Also, the attached showing the two torroid pictures, please confirm they are both exactly one turn primary?
 

Attachments

  • 100 TO 1 CST on E20,10,6 Former.jpg
    100 TO 1 CST on E20,10,6 Former.jpg
    56.7 KB · Views: 166
  • Leakage inductance with twisted primary CST.jpg
    Leakage inductance with twisted primary CST.jpg
    70.5 KB · Views: 126
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