From: "Ian Buckner"
Subject: Re: Quieting all these fan motors
Date: Mon, 16 Sep 2002 12:06:25 +0100
Organization: Agilent Technologies
NNTP-Posting-Date: Mon, 16 Sep 2002 11:06:28 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
X-Cache: nntpcache 2.3.3 (see http://www.nntpcache.org/)
"George Gonzalez" wrote in message
> Thanks for all the comments.
> I guess I didnt make myself quite clear enough--
> I'd like to be able to have the fan speeds proportionally
> not just ON/OFF. I suspect having fans cycling ON/OFF randomly
> seconds to minutes would not be almost as bad for my equilibrium,
> equipment's) as having them ON all the time.
> Plus it would be nice if this could be done with just a thermistor.
> it can be done, your newer, typical, just slightly better than dirt
> PC power supply often has a 12V motor and a thermistor for speed
> Another question is exactly *where* to place the thermistor for
> temperature control. Probably near the hottest component, which
> the power supply pass transistor. If I can ensure there always is
> flow, measuring the outgoing air temperature might also be a good
Depending on how much work you want to go to, you may find
www.quietpc.com has useful "bits". I haven't used them myself,
but the dBA figures they quote look pretty good. They also do
a fan controller.