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.




1007 posts

Uber Geek
+1 received by user: 8

Subscriber

Topic # 108866 7-Sep-2012 10:31 Send private message

Hi,
Does anyone know where I can buy a 3.3V d.c. 40mm x 40mm fan?

The fan in my network switch has died.
I have looked on Ebay, Element14, RS, local computer stores, Google. The only source I can find is DHgate, minimum qty 100 pcs. 5V and 12V are prolific of course.

The switch internal PSU has only 3.3V output.

I found replacement 40mm fans for specific Cisco etc switches, but there is no mention of operating voltage.

I have tried 5V fans, but they turn so slowly that virtually no air is shifted.
The switch gets too hot with no fans.

The only other option I can think of is to buy/assemble a 3.3V to 5V dc-dc converter.
Cheers,

Create new topic
7025 posts

Uber Geek
+1 received by user: 498

Trusted
Subscriber

  Reply # 682712 7-Sep-2012 10:39 Send private message

Can you not buy the replacement part from your switch vendor? What make/model is the switch?




Asus eee pad transformer
iPod 2G
Windows 7 PC
Lots and lots of Nikon camera gear

2702 posts

Uber Geek
+1 received by user: 400


  Reply # 682722 7-Sep-2012 11:05 Send private message

Is there a 5v power rail in your switch?



1007 posts

Uber Geek
+1 received by user: 8

Subscriber

  Reply # 682776 7-Sep-2012 12:28 Send private message

timmmay: Can you not buy the replacement part from your switch vendor? What make/model is the switch?


Its a budget brand like CNet or something more obscure so I had assumed not. I won't be home until Sunday so I can't provide that information until then. I guess it could still be possible.



1007 posts

Uber Geek
+1 received by user: 8

Subscriber

  Reply # 682778 7-Sep-2012 12:31 Send private message

RunningMan: Is there a 5v power rail in your switch?


No, only 3.3V, and 330V dc. I think the regulation is done on the switch PCB, to an even lower voltage.
I will check though, because if there are linear regulators on the power supply, there must be a ~4V rail.



1007 posts

Uber Geek
+1 received by user: 8

Subscriber

  Reply # 684117 10-Sep-2012 21:34 Send private message

There isn't any other d.c. rail on the power supply, just the unregulated "3.3V" rail that is then regulated on the logic PCB.

The switch is an Edimax ES-3132R

Voice Engineer @ Orcon
1927 posts

Uber Geek
+1 received by user: 435

Trusted
Orcon
Subscriber

  Reply # 684121 10-Sep-2012 21:38 Send private message

Have you tried taking the label or plug out of the back of the fan (where the bearing is) and adding a drop of 4-in-1 oil?  This will often get another few years out of a sleeve bearing fan, they usually only fail because the bearing has dried out and re-lubing the sucker is all it takes.  Might save you an expensive exercise!

Otherwise check polulu, sparkfun or mindkits for 3.3v -> 5v step-up converters...

Edit: oh and not WD-40 or CRC 5-56 - these will get you going for a while but will dry out after a few months.



1007 posts

Uber Geek
+1 received by user: 8

Subscriber

  Reply # 684160 10-Sep-2012 22:38 Send private message

ubergeeknz: Have you tried taking the label or plug out of the back of the fan (where the bearing is) and adding a drop of 4-in-1 oil?  This will often get another few years out of a sleeve bearing fan, they usually only fail because the bearing has dried out and re-lubing the sucker is all it takes.  Might save you an expensive exercise!

Otherwise check polulu, sparkfun or mindkits for 3.3v -> 5v step-up converters...

Edit: oh and not WD-40 or CRC 5-56 - these will get you going for a while but will dry out after a few months.


Thanks, yes. When I got the switch (2nd hand) the fan was a bit noisy, so I peeled off the label and put in some molybdenum grease. The fan was fairly well seized and hard to turn when I took it out. Perhaps I could have re-lubricated it, but I didn't think of that before I threw it out.

Thanks for the suggestion of polulu etc, I'd never heard of them. I nearly ordered a step-up converter for only US$5.45, but then when I saw the postage price it occurred to me to check Ebay, since Chinese / Hong Kong postage is often only $1. Sure enough I bought 2 units for 99c each plus $1 postage. I guess I'll get them in a couple of weeks.



1007 posts

Uber Geek
+1 received by user: 8

Subscriber

  Reply # 689879 22-Sep-2012 14:36 Send private message

The voltage boosters arrived, and I installed one inline with the fan. Now it is whining away like a real switch.
Initially it was rattling horribly so I peeled back the label and put some molybdenum grease in the bearing.

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:

Snap refuses to replace faulty gear
Created by Brendan, last reply by Brendan on 26-Oct-2014 16:11 (25 replies)
Pages... 2


Speed limit when overtaking? Teach me please.
Created by nakedmolerat, last reply by Hobchild on 26-Oct-2014 00:11 (92 replies)
Pages... 5 6 7


House Auctions
Created by t0ny, last reply by joker97 on 26-Oct-2014 15:33 (53 replies)
Pages... 2 3 4


VDSL, which router/modem sub $200?
Created by TeaLeaf, last reply by NonprayingMantis on 25-Oct-2014 19:48 (28 replies)
Pages... 2


Neon - Sky's new streaming service
Created by JarrodM, last reply by JimmyH on 25-Oct-2014 17:37 (29 replies)
Pages... 2


5Ghz AP recommendations?
Created by ubergeeknz, last reply by sbiddle on 24-Oct-2014 12:42 (12 replies)

Snap have failed our company!
Created by dafman, last reply by kornflake on 23-Oct-2014 17:41 (37 replies)
Pages... 2 3


Thief taunts 12 year old via stolen laptop
Created by macuser, last reply by charsleysa on 22-Oct-2014 23:49 (12 replies)


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.