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Hi Rowland,
As you said, time is money, so to simplify things, just have a separate adaptor for your dew heater and power the remainder with a single supply
That will reduce noise and keep it simple.
Remainder would be a camera, mount, USB hub, none of which are noisy.
You can get a 4 or 5 core wire from jay car, and run both supplies via the same cable. Just use a 5 pin connector on the box.
That's what I do.
Cheers
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