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>From suter  Sun Oct 28 11:07:21 2001
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Date: Sun, 28 Oct 2001 10:50:00 +1000
From: David Jericho <davidj at diskpig.org>
To: general at lists.humbug.org.au
Subject: Re: [H-GEN] Cisco SOHO 77 ADSL Router
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In-Reply-To: <3BDB39A7.F1FCEC25 at bigpond.net.au>; from mtbilbro at bigpond.net.au on Sun, Oct 28, 2001 at 08:48:07AM +1000
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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.

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

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

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

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

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

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

--
David Jericho

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