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Well if the issue is RF interference then indeed the best method of prevent contamination of the power supply is to have separate power supplies.
I guess you could drive separate regulated circuitry but you'd lose more voltage across these circuits.
As wasyoungonce pointed out, a Shottky diode would be better than a standard power diode (my thinking cap wasn't on).
It's always concerned me about dewzapper PWM systems that generate high RF interference. IMHO you'd only need the systems to run at 100Hz at the most. I'm still yet to build my system up so I'll be playing around with the best frequency.
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