Ferrite toroids for RC planes

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What are ferrite toroids, how do they work and when would you use them on an RC plane?
In this video I try to demonstrate what these tiny rings can do to reduce the noise that sometimes affects our RC models.
While making this video I made some very interesting observations regarding switching UBECs and I'll be doing a follow-up video shortly in which I will take a close look at the various UBEC options and how they perform.
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