Digital Pot or Digital Regulator

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i looking way take 18v , digitally regulate between 6 , 16v. original idea use arduino control digital pot in lm317 regulator circuit digital pots find have small wiper current. need @ least 0.5a safe. recommendations on digital regulator?

quote
i need @ least 0.5a safe.
you sure of that?
the wiper current not going output current of regulator know.


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