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Reply to "Convert 18V AC to regulated DC?"

You do NOT see a linear regulator, that is a switching regulator.  A linear regulator handling the power you're talking about would be a hot potato!  The ferrite coil you see is the inductor for the switcher, the LM2596HV chip.  It will run MUCH cooler than a linear supply and also handle way more current than a linear supply that's anywhere close to this size.

Truthfully, do you really think you can do better for $3?

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