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Old 27-08-2011, 10:12 AM
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mithrandir (Andrew)
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Join Date: Jan 2009
Location: Glenhaven
Posts: 4,161
Targus make mains and 12v powered laptop power supplies and they come with the right plug for just about every laptop ever built. The plugs are different for each voltage and there is some smarts in the plug to tell the supply what voltage to deliver.

Not cheap though.
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