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Am I too missing something? Why can't you go back to your original 2-diodes solution - whichever has the higher voltage provides the power? But ensure that the
may need a gate resistor circuit looks very good but for Q2 i would use a relay and remove 1 diode,since you will get voltage drop,plus a lot of heat on Q2
On Thu, 24 Dec 2009 19:06:49 -0000, "oric_dan" <oric_dan@...> ... The data sheet for the 4412: http://cds.linear.com/docs/Datasheet/4412fa.pdf Later, Jon