It's not a simple question, as you did not post the operating current of the device at 3.3v.
the board I want to power draws 30mA
no problem, 30mA is ok.
ok but where do I draw the 3.3v from? The AUX ports?
Spektrum/DSM port vas 3v3.
ah great. I have a few spare plugs for that. Thank you.