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I can't find any information regarding the polarity of an ACER Aspire Notebook charger. I lost it, I have all kind of chargers but I need to know the polarity of the original charger.

I am familiar with the other requirements like volts and amps.

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Acquiring a voltmeter or (digital) multimeter could be a worthwhile purchase. – sawdust Oct 15 '11 at 23:16
Positive. – CORE Oct 15 '11 at 23:17
@sawdust It may be difficult to actually measure the polarity. With my charger, there's no way to actually insert any of the popular probe types deep enough to make contact with the inner conductor. Also for my 7720G, it's positive at the center and negative on the outside. – AndrejaKo Oct 15 '11 at 23:59
@Lucas Which notebook do you have exactly? Do you at least know the generation? Do you remember the manufacturer of the power supply? There's no way to answer this question in its current form except to list configuration for every type of power supply Acer ever shipped with its Aspire laptops. – AndrejaKo Oct 16 '11 at 0:03
@AndrejaKo - Difficult?! If the center pin socket is that much smaller than a probe tip, then there's always a piece of solid wire or a resister lead. – sawdust Oct 16 '11 at 21:48

2 Answers 2

Some information I have available:

Acer Aspire 4720z : positive at center, negative in the outside. Acer Aspire One : positive at center, negative in the outside.

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Like most electronics, it's positive tip, negative barrel/ring.

Back of an Acer Aspire Power Brick: enter image description here

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