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Dual Powersupplies questions

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You could run into problems if the 5V from the two PSU's is noticeably different. Let's say that one is 4.8V and the other is 5.0V. If you connect them together you'll get 5V current going from one PSU into the other and it might trigger some kind of short circuit sensor.
 
There is theoretically one way you could connect the 5V rails. If you connected a high current diode on each rail and tie the diode cathodes together. This would prevent the PSUs from influencing each other and add the currents together on the rails. However, there would be about a 3/4 volt drop across the diodes giving you a 4.25 V output if the input was 5 V.
 
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