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:
(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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