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I use mains regulated for the mount and mains un-regulated for focusers and cameras. I use a UPS to line condition and protect all this gear and reduce noise on the line, and run even serial connections between the hand controller and PC through specialist surge protectors - like the kind petrol stations use to protect bowsers from lightning strikes.
A regulated PSU or transformer is generally only $20 - $30 more than a un-regulated one if you shop around (especially at Jaycar).
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