add Bourns SRF0905 line filter
https://www.bourns.com/docs/Product-Datasheets/SRF0905.pdf
SMD line-filter, or common-mode choke.
Open Questions:
- in older (v4?) symbol libraries the "CM-CHOKE" symbol was suitable. In the new v5 libraries "EMI_Filter_LL" comes close, but has the wrong pin numbering. New symbol suggestion: https://github.com/KiCad/kicad-symbols/pull/1338
- I have placed it in the Filter library, but maybe some other place is better for a common-mode choke or line-filter?
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