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Originally Posted by sparksandtabs
I just got done reading through the white paper. I don't really understand why they used 3 9 volt batteries.
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The OI can draw up to 1500 milliamps. A standard 9v battery is good for about 500 milliamp-hours, which would be drained in as little as 20 minutes. Using three 9 volt batteries in parallel gives at least an hour of useful power.
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I thought you could only input 5 volts. But I guess you can input anything?
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You're only "authorized" to give it 9 volts, but it runs fine on 12 (which I think is what gets supplied when it's tethered).
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Also what about a voltage regulator?
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The OI has one built in. I'm pretty sure it runs on five volts internally, which would normally require at least seven volts of input to keep well regulated.