Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.
Buying anything on Amazon? Please use the Geekzone Amazon aff link.




248 posts

Master Geek
+1 received by user: 23


Topic # 83028 9-May-2011 12:01 Send private message

Hi All,
Just a comment really.
After going through 2 * WAG54GP2 devices, 3 * WAG310G devices I now have a SPA2102
I had to buy a SPA2102 about 18 months ago when there was no stock of the WAG310G.
Anyway, the SPA2102 has been playing up for a wee while, crackling line and poor performance.
I changed the power supply like a few people had mentioned and the call quality is back to perfect.
I could not believe the SMPS could do that, I would have thought there would have been another filtering cap on the device end to take away any PSU ripple and fluctuations.
Anyway if you are have trouble with the voice quality, try changing the power supply. It has worked for me.
What I would like to see is a dual / triple outlet PSU so I only have to have one pluged in that can feed the Modem, The ATA and the Switch.

Cheers
John




I know enough to be dangerous

Create new topic
2914 posts

Uber Geek
+1 received by user: 34

Trusted

  Reply # 467709 10-May-2011 18:49 Send private message

The output capacitor filters a lot of ripple, and is filled with an electrolyte. Over time it dries out, series resistance increases, the capacitor heats up, and it pops open. Then the voltage control loop is upset, can't react fast enough to load changes.

The other failure mode is the rectified-mains bulk storage capacitor dries up. Or dried solder joints around power devices (MOSFET and rectifier diode).

On PC power supplies the symptoms are reduced by using many capacitors in parallel, but they also degrade faster than you expect.




You can never have enough Volvos!




248 posts

Master Geek
+1 received by user: 23


  Reply # 468021 11-May-2011 18:56 Send private message

True but I would not expect that after 18 months, after 5 years or so I would expect problems with caps drying up.
When i used to repair VCR's ( remember them ) I would always use 105 deg or 125 deg caps in the PSU, they cost a few cents more but lasted alot longer.
When I used to import cap's they were the same price for 105 deg as the standard 85 deg so we never stocked or sold the 85 deg caps.
I guess when you are building 100k units a week and can save 10cents a PSU it adds up to big savings.
Hard to buy quality any more.
John




I know enough to be dangerous

Create new topic




Twitter »
Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





Trending now »

Hot discussions in our forums right now:

Netflix officialy launching in NZ in March
Created by jarj, last reply by tdgeek on 21-Nov-2014 19:08 (97 replies)
Pages... 5 6 7


Click Monday Deals
Created by mrtoken, last reply by Krishant007 on 24-Nov-2014 17:11 (25 replies)
Pages... 2


Gull Employment Dispute.
Created by networkn, last reply by networkn on 25-Nov-2014 13:16 (103 replies)
Pages... 5 6 7


The Warehouse pulling R18 games and DVD's
Created by semigeek, last reply by nigelj on 25-Nov-2014 13:26 (32 replies)
Pages... 2 3


Current Netflix payment method as of Nov 14 - Cant pay
Created by andynz, last reply by Kiwipixter on 25-Nov-2014 10:45 (33 replies)
Pages... 2 3


Voda VDSL, Horrid offnet performance.
Created by TimA, last reply by Demeter on 25-Nov-2014 11:49 (28 replies)
Pages... 2


SEO spammers
Created by freitasm, last reply by jamesrt on 24-Nov-2014 16:09 (25 replies)
Pages... 2


SSD hard drive in aging HTPC disappointingly slow
Created by watman, last reply by joker97 on 23-Nov-2014 22:02 (20 replies)
Pages... 2



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.