An EMI filter, or electromagnetic interference filter, is an
electronic passive device which is used in order to suppress conducted
interference that is present on a signal or power line. EMI filters can be used
to suppress interference that is generated by the device or by other equipment in
order make a device more immune to electromagnetic interference signals present
in the environment.
https://www.futureelectronics.com/c/passives/filters--emi-filters/products
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