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Where is the GAP in SMPS transformer


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Hi
I am designing a 150W Flyback SMPS. I have read some articles. in Flyback transformer calculatoin, there is a parameter ( Lg ) that indicates the GAP and equals to "i.e.  0.0252cm = 9.917 mInches". but I don't know where is the gap on a transformer? When I take a look at a TV Transformer, I didn't see any distance. the points which I have marked red and written "there is no space here" is filled with Glue.

Do you know where this GAP is?

ThanX in advance
Sh.Farmanesh

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