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I was thinking one of the smaller Arduino clones. Perhaps built into one of the 6 slotted, vented extensions. Then powering the thing becomes the issue. Time to read the data sheets on the sound boards!!
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Youngling
The Pro Mini and Nano variants would be fine running off a 7.4V pack. Their on-board regulators are supposed to be able to take up to 12 volts. I've powered a Nano with an 9.6V NIMH rechargeable battery pack before.
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