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Originally Posted by Rickertsen2
Sure. Its really simple. Get yourself a 12V SLA battery from an alarm system, or any other battery you happen to have on-hand, a 9v voltage regulator chip, and either buy or cannabalize a plug. Wire it all together and you have a mobile oi.
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I would advise the addition of a voltage divider between the battery and regulator. Otherwise, you might end up with a VERY toasty (and unhappy) 7809.