Date: Fri, 3 Jan 1997 12:12:20 +0100 From: j@uriah.heep.sax.de (J Wunsch) To: freebsd-hackers@freefall.freebsd.org Subject: Re: advice sought - Quantum 2GB Atlas broken Message-ID: <Mutt.19970103121220.j@uriah.heep.sax.de> In-Reply-To: <199701030757.IAA28651@ghpc6.ihf.rwth-aachen.de>; from Thomas Gellekum on Jan 3, 1997 08:57:14 %2B0100 References: <Pine.BSF.3.95.970102183826.18348A-100000@super-g.inch.com> <199701030757.IAA28651@ghpc6.ihf.rwth-aachen.de>
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As Thomas Gellekum wrote: > > Now I just have to find > > a way to detect when the CPU fan dies... > > We use a current detector in the power supply wires for the fan. If > the current increases the fan is stuck -> annoying beep and possibly > toggle turbo switch. Btw., we've got a fairly old IBM 5.25 inch SCSI device case around (i think it used to house a tape drive, or a CD-ROM drive). The fan of its power supply is very small and very noisy... I recently wanted to use that case, but figured that the ventilation wasn't adequate for me. I tried to pull the plug of the fan -- the power suplly stopped. Ok. They're watching the current flow, no problem! Clamp the fan using a match. The power supply stopped. Hrmpf. I think they're using a small NTC resistor to watch the airflow... -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)
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