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SMPS + linear supply interference

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lukasz.kostka:
Hi.

I am working on a digital dummy load with DAC/ADC and a MCU. I'd like to use my radial 12V fan from an old server which takes up to 2,5 A peak. Linear regulators won't make it so I am left only with SMPS regulator. I am thinking about to leave only 12V for fan to reduce noise on linear / analog part. Does it make any sense ? Maybe I need to take car of something else ? I've never designed any SMPS regulator circuit before.

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