[SATLUG] OT: Replacing a power adapter

Christopher Connell connell.christopher at yahoo.com
Sat Feb 19 18:17:29 CST 2011


I'm a noob, but I'd imagine you'd want to check MB specs. And make sure your board can support the higher amps. 

--- On Sat, 2/19/11, Walt DuBose <dubose at texas.net> wrote:

From: Walt DuBose <dubose at texas.net>
Subject: Re: [SATLUG] OT: Replacing a power adapter
To: "The San Antonio Linux User's Group Mailing List" <satlug at satlug.org>
Date: Saturday, February 19, 2011, 4:20 PM

On 02/18/2011 09:25 PM, Geoff Edmonson wrote:
> On 02/18/2011 09:20 PM, Alan Lesmerises wrote:
>> A few days ago when they had those rolling black-outs, the power
>> adapter for my scanner apparently died. I don't know if that was the
>> cause or if it was coincidence, but it was dead nonetheless.
>> 
>> I found what appears to be a replacement at Goodwill, but it's not
>> quite an exact match. The old one was 12VDC/1.25A output, and the
>> replacement is 13VDC/1.3A.
>> 
>> I'm thinking that's probably not enough of a difference to matter, but
>> I wanted to get your (collective) opinion or if any of you have had
>> any similar experiences.
> 
> I don't feel that 1v is enough difference to matter. It seems it's got
> enough current handling capability.
> 
> What I -would- watch for, is that the center-pin of the female plug
> (coming from the power supply) is the proper polarity.
> 
> 

Many times the current rating is more important than the voltage.

If the wallwart is 12V @ 1.25A it can probably take up a 12V @ 1.5-1.7A.
However, if its needs to be 12V and you find one at 13.5V or 14V @ 1.7A, and your device only required 1.25A, then the output when you device is turned on could be 15-16V.

WallWarts ARE NOT voltage regulated and are regulated by the amount of current they can supply.

That said, if you don't have one of the $3 voltmeters from Harbor Freight, then get one and measure the voltage to insure that the WallWart isn't over 1.5V to 2V over you needed voltage without being plugged into you device.

Walt/K5YFW

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