[SATLUG] OT: Replacing a power adapter

Charles Hogan cd_satl at futuretechsolutions.com
Sat Feb 19 00:15:39 CST 2011

As an electronics tech by training, no longer by trade, I have to agree 
completely.  On matters such as this, mainly make sure that the pin 
polarity is the same, and the power supply can provide the same or 
greater amps.  The device should be able to handle a voltage of plus or 
minus 10%.  Anything that has sensitive voltage requirements should have 
built in voltage regulation that would compensate for any variance in 
the supply power.


On 02/18/2011 11:12 PM, hc at lookcee.com wrote:
> -----Original Message-----
> From: "Geoff Edmonson"<w5omr at att.net>
> Sent: Friday, February 18, 2011 21:25
> To: "The San Antonio Linux User's Group Mailing List"<satlug at satlug.org>
> Subject: Re: [SATLUG] OT: Replacing a power adapter
> 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.
> I agree on both points, I doubt that the board in the scanner is that sensitive. However, theoretically the increased VDC is roun 8% and will shorten the life of the unit. I of course would reason that by time it crapped it would also be obsolete and goferit.
> hh

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