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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,

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  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?




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

Is there a 5v power rail in your switch?



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  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.



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  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.



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  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

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  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.



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  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.



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  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.

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