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What is the main purpose of ferrite core on cables(e. g. power adapter cables, HDMI cables)?

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What is the main purpose of ferrite core on cables(e. g. power adapter cables, HDMI cables)?

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  1. Ferrite acts as a large lossy inductance at high frequencies, so the core will suppress current spikes in the cables.  Think of it as a "shock absorber" for very short spikes of current.  They have no effect on the desired signal carried by the cable.

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