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Troy,
The other issue to consider is whether you get interference in the mount control electronics from the dew heater PWM circuit if you run them from a single supply. I don't know if there is a way to test for this but I've kept my supply to the dew heaters separate to avoid this issue.
I'm using a DSE regulated 12V supply to power the mount, watec video camera and light box and a supercheap auto 12V supply for the dew heaters.
Peter
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