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I have an old dlink wi-fi router to connect old 802.11g devices at home. It's power supply just fried after a storm.

Buying a new power supply is almost the same price as a used router like mine, and I found a power supply at home from an older router (not even wi-fi) I was planning to use it, but I don't have that much experience with eletronics... Can someone tell me if they are compatible?


Fried power supply specs


Alternative power supply specs

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up vote 4 down vote accepted

It looks like the Alternative Power supply would be compatible.

It has a higher current limit than the old one -- which is good.

There's no indication of the polarity of the output for the old supply, but the alternative one (with the +ve connection in the centre) looks like the standard, so I think you're OK.

But beware that if the old power supply was fried in a storm, some of the surge may have appeared on its output and the router may have been damaged too.

You'll have to take a chance and try it.

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I've tested the router with fried power supply elsewhere, it's working. The only problem is with the power supply. – Somebody still uses you MS-DOS Jul 12 '11 at 4:14
That's good news. I once had a lightning strike at home, and it killed all the equipment. – pavium Jul 12 '11 at 5:35
I tested and it's working. – Somebody still uses you MS-DOS Jul 12 '11 at 13:49

Yes, as long as the connector fits and the polarity is correct (center positive in the case of the new supply), you should be able to use it.

The most important thing are the voltages, which match. The second most important thing is the current (amps), which is actually greater. The current correlates to the ability to do work. If it were less, it would not be able to deliver the necessary voltage (without problems i.e. ac leaking into the dc), which would cause problems in the router, but since it is greater, that is not a problem.

It is advisable to look on the router to see if it needs center positive or center negative.

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Some Linksys router power adapters are not DC output, but AC, so any adapter may not work if it is not the proper AC or DC output, and will damage the router, just a warning. The connector size is irrelevant. You notice that label does not specify the output if it is AC or DC. – Moab Jul 12 '11 at 15:36
The top one does not, but it is still almost certainly DC based on the voltage. The bottom one says it is specifically DC based on the symbol. – KCotreau Jul 12 '11 at 15:44
They will still mark the tip as + even on AC. Only a AC/DC volt meter will show for sure. – Moab Jul 12 '11 at 20:01

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