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Help understanding this EMC circuit

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desertgreg:
Can someone help me understand the recommended EMC circuit in this datasheet:

https://www.cui.com/product/resource/v78w-500.pdf

Its at the bottom of page 4, I don't recognize the big 'Z' symbol.  Also attached.  Thank you for any help!

fourfathom:
That "Z" just indicates that the two inductors share a common core -- otherwise called a "common mode choke".  It's another way of drawing a transformer, when the windings are far apart on the schematic.

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