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>From suter  Tue Nov  6 12:59:38 2001
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Date: Fri, 2 Nov 2001 14:20:36 -0800
From: Kevon Cocks <kevfran at acenet.net.au>
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To: David Jericho <general at lists.humbug.org.au>
Subject: Re[2]: [H-GEN] Cisco SOHO 77 ADSL Router PSU Fans
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[ Humbug *General* list - semi-serious discussions about Humbug and  ]
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Hi David,

Saturday, October 27, 2001, 4:50:00 PM, you wrote:

DJ> [ Humbug *General* list - semi-serious discussions about Humbug and  ]
DJ> [ Unix-related topics.  Please observe the list's charter.           ]
DJ> [ Worthwhile understanding: http://www.humbug.org.au/netiquette.html ]

DJ> On Sun, Oct 28, 2001 at 08:48:07AM +1000, Tony Bilbrough wrote:
>> I use a 386 as a Router [w Potato] and the Power supply fan is getting a
>> little noisy . I was thinking of replacing it, and had heard that  it
>> could be run at just 5 volts.

DJ> Well, I'm no engineer, but variable speed fans are getting common nowdays
DJ> in the more yuppie PCs. My power supply from Enermax has a variable speed
DJ> fan, although it's usually running flat chat :) No reason why you couldn't
DJ> use a 5 volt fan. 

>> Are you saying that this sort of application does not need a fan at all?

DJ> You'd have to think a bit about the airflow inside the case, but looking at
DJ> things like high end audio gear, and monitors, so long as you've got 
DJ> good quality parts, there is no reason why you have to have a fan. 

DJ> The fans purpose isn't to blow air onto hot parts, it's to remove hot air
DJ> generated by hot parts. My 1500w Marantz amplifier here at home has no fans,
DJ> and is a Type A amp (runs at 100% all the time), and yet manages to run
DJ> fine on the hottest of days. When I put my hand by the vents on the side of the
DJ> chassis, I can feel a draft just caused by convection.

>> I must admit the router does not work too hard. It was built as a
>> project to see if it could be done! 2 home pc's hang off it which only
>> one accesses the net.

DJ> I read the other day that your average 486 nowdays only uses 10 - 15w of 
DJ> power... that sort of heat is easy to dispose of with good airflow.

DJ> Of course like I said the other day, this was a simple incomplete experiement. 
DJ> I've never built a fanless PC before, but the noise of my hardware at the moment
DJ> is tempting me to try.

DJ> --
DJ> David Jericho

DJ> --
DJ> * This is list (humbug) general handled by majordomo at lists.humbug.org.au .
DJ> * Postings to this list are only accepted from subscribed addresses of
DJ> * lists 'general' or 'general-post'.

  Ongoing  debate  re  cooling  of  PSU's.  Somewhere  along  the line
reference  was  made to running fan on 5v supply. Some years ago, this
practice  was  not  uncommon  with  some  commercial  IBM  type  clone
builders.  The idea being to market a quiet unit. The downside is that
whilst most fans will run happily on 5v, there is usually a problem of
unreliable  initial  starting.  5  volts  barely  produces  sufficient
starting  torque  & fans commonly only oscillate rather than rotate. A
more  reliable under voltage level could be had from 12v source via an
adjustable  voltage  regulator  at  a few dollars cost. Bits from Dick
Smith etc.

Regards,

 Kevon Cocks

--



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