28 June 2008

Ferrite beads suppress high frequency noise

Via Lifehacker, I read about using ferrite beads to stop cell phones from buzzing during exposure to high frequency noise. I had no idea that ferrite beads are commonly found in USB cables.

That made me curious about ferrite beads. Since ferrite is magnetic, the bead probably acts like an inductor or an inductor in series with a resistance. Maybe with an L/R time constant?

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