convert high voltage dc to low voltage dc

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Khurram1965

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how can I get 12V (30 ma) dc from 400V dc
 

Buck, Flyback.

Have a look at the Power Integrations website for a selection.
 

If efficiency is not a problem... simple potential divider is enough...otherwise use a 12v smps. The SMPS should be rated for 290V AC input.
 

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