Thanks Lazar. Good tosee the swift action. In my case, I'm running off LiPo via an LDO regulator directly to the 3.3V input so not using the USB input on the Dashs. I determined that 3.3V can be connected to the secondary of the switching regulator used on the Dash with no problem (when no USB power connected). At worst, the top FET in the regulator will turn on, connecting some extra capacitance across the output- which is a good thing should it happen. Regds, Dave