How to get 5 volts from 4xAA batteries?
Measuring some brand new AAs, they're about 1.6v when new, which drops under load, I know. So four AAs of course add up to 6.4v, possibly blowing my low current circuit.
And isn't a 7805 voltage regulator only good with aroundabouts 7-8 volts source because of how they work?
Plus DC-DC converters are expensive, and resistors are wasteful. :-)