Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!uwm.edu!gem.mps.ohio-state.edu!apple!mips!vaso
From: vaso@mips.COM (Vaso Bovan)
Newsgroups: sci.electronics
Subject: Re: Need temperature-sensing fan control circuit
Summary: Fan Controller Package
Message-ID: <29246@buckaroo.mips.COM>
Date: 11 Oct 89 00:16:49 GMT
References: <36251@coherent.coherent.com>
Reply-To: vaso@mips.COM (Vaso Bovan)
Distribution: sci
Organization: MIPS Computer Systems, Sunnyvale, CA
Lines: 19

In article <36251@coherent.coherent.com> dplatt@coherent.com (Dave Platt) writes:
>I need a small circuit with which to control the speed of a 12V DC
>cooling fan.  I can take a guess at what sort of circuit might do the
>job, but I'm not enough of a hardware-hacker to be sure that it will
>work or which components would be the most appropriate.  If anybody out
>there can offer a quick critique of my ideas, suggest alternate ones, or
>recommend appropriate parts, I'd much appreciate it.
>
>I have a hard-disk cabinet that includes a 2.5" 12VDC cooling fan.  The
>fan runs at a high rate of speed, and emits a very annoying whine.  It's
>moving much more air through the cabinet than seems necessary... the
>tape mechanism I'm using doesn't draw much power.  I believe the fan
>could be quieted down by dropping its voltage... but I don't want to
>risk overheating.
>

Several companies make "integrated" fan controllers. One thermistor-
controlled package is the "DC-100", made by Quality Thermistor, at
(208) 377-3373   Fax: (208) 376-4754