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Originally Posted by sanddrag
I think you should put the 4 AAs in series for 6v nominal.
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A 7805 regulator isn't going to work very well with only 6 volts of input, and even with a "low dropout" regulator instead, the input voltage will eventually drop below 5 volts as the cells are used. To get a steady 5v supply, the suggestion to use six of them in a 9 volt configuration is more appropriate.
sparksandtabs might be able to get away without a regulator, though. The HITEC servos we use are very happy running off the unregulated 7.2v backup battery.