From owner-freebsd-hackers Fri Jan 3 03:21:42 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.4/8.8.4) id DAA13866 for hackers-outgoing; Fri, 3 Jan 1997 03:21:42 -0800 (PST) Received: from irz301.inf.tu-dresden.de (irz301.inf.tu-dresden.de [141.76.1.11]) by freefall.freebsd.org (8.8.4/8.8.4) with SMTP id DAA13861 for ; Fri, 3 Jan 1997 03:21:34 -0800 (PST) Received: from sax.sax.de (sax.sax.de [193.175.26.33]) by irz301.inf.tu-dresden.de (8.6.12/8.6.12-s1) with ESMTP id MAA29903 for ; Fri, 3 Jan 1997 12:21:26 +0100 Received: (from uucp@localhost) by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id MAA07580 for freebsd-hackers@freefall.freebsd.org; Fri, 3 Jan 1997 12:21:25 +0100 Received: (from j@localhost) by uriah.heep.sax.de (8.8.4/8.6.9) id MAA14449; Fri, 3 Jan 1997 12:12:20 +0100 (MET) Message-ID: 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 References: <199701030757.IAA28651@ghpc6.ihf.rwth-aachen.de> X-Mailer: Mutt 0.55-PL10 Mime-Version: 1.0 X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) In-Reply-To: <199701030757.IAA28651@ghpc6.ihf.rwth-aachen.de>; from Thomas Gellekum on Jan 3, 1997 08:57:14 +0100 Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk 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. ;-)