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I'm umming and ahing about just using a 7805 for the pi as it draws less then half an amp, what do you reckon?
Also, where is the "Useful" button??
Am I right in thinking that I could just 50% modulate it to get an equivalent 3v output from 6v or should I be using RMS values?
I'd use the LiPo, straight into the Arduino input voltage, as the Arduino has an on-board regulator.