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I was poking around a video amplifier and — in its dual-rail power supply — saw a pair of inductors unlike any inductors I've come across before:

inductor left inductor right

(These are the two sides of the same inductor; the other looks the same.)

What properties is this type of construction trying to achieve?

By the look of things, these sit between a switch mode supply and a 78xx/79xx-based linear regulator. (Happy to provide more details; just let me know of what kind.)

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It's just a multi-turn ferrite bead, used to block high-frequency signals. The multiple turns make it more effective at lower frequencies than normal straight-through beads.

You'd get pretty much the same effect by putting five regular beads in series.

For example, here's a datasheet from Bourns.

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  • \$\begingroup\$ Just came across this Wiki post that had a picture of this same part. Lots of good information. en.wikipedia.org/wiki/Ferrite_bead \$\endgroup\$ Commented Nov 9, 2018 at 14:33

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