[SATLUG] OT: Replacing a power adapter

Alan Lesmerises alesmerises at satx.rr.com
Sat Feb 19 10:46:03 CST 2011

It's obvious there are quite a few of you that are much more 
knowledgeable than I am when it comes to electronics.  Gut feelings are 
definitely no match for informed insight, and I appreciate your 
feedback.  Thanks.

Al Lesmerises

On 2/19/2011 12:15 AM, Charles Hogan wrote:
> 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.
> Chuck
> 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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