Reply to post: It's called a choke.

Bright spark dev irons out light interference

Suricou Raven

It's called a choke.

Ferrite choke, used to block common-mode current. It doesn't stop all interference, only high-frequency common-mode interference. Fortunately in this case, that must have been the type of interference causing the problem.

It works the other way too - if a device is generating interference, a choke in the right place will greatly reduce the strength of that interference. Be nice to your local ham radio operators and just stick chokes everywhere, please.

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