Quote:
Originally Posted by norman_nomad 
The only reason to have an external supply would be to isolate any potential stray interference from the toroidal transformer (already pretty low) and because one dedicated PSU box is a cheaper way to power multiple units.
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i think the whole external power supply issue is all about being cheaper because its a hassle to develope a power supply that is ul listed- certified or something like that. the way it was explained to me that its easier to go with a power supply that has been certified already .