DC in when sourcing 3.3V
I'm looking at using some 3.3V peripherals that might need more amps than the Pine can deliver.  

Firstly, how much juice can the 3.3V pins source when powered by the on-board regulator?  (I'm assuming the various +3.3V pins on the Euler/Exp/PI bus are all connected and thus can source the same amount within their aggregate limit, or are their different limits for different 3.3V pins)

Secondly, if I need more +3.3V juice than the board can source, can I simply provide it via one of the 3.3V pins?  If I do this, can I disable the on-board 5V-->3.3V regulator some how?  (I want to avoid any chances of a voltage difference between the two 3.3V rails leading to one source sourcing into the other.)

Ideally, I'd like to use my own external PSU for supplying both 5V and 3.3V, and eliminating any hardware limitations of the boards on-board.

What do I need to do if I want to provide both +5V and +3.3V DC in?

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