diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   PC Based (http://www.diyaudio.com/forums/pc-based/)
-   -   Please! (http://www.diyaudio.com/forums/pc-based/154512-please.html)

Lumba Ogir 5th November 2009 10:33 PM

Please!
 
Hi everyone,
how to simulate a fan (to fool the computer) on a 3 pin system fan connector (ground-+12V-sensor)?
Thanks.

MJL21193 5th November 2009 10:49 PM

Measure the DC resistance on the gnd/12V leads from the fan and match it with a fixed resistance maybe? Worth a try.

Gary P 6th November 2009 03:02 AM

Are you trying to get the computer to not give you the "CPU fan fail" warning at boot?

Look in the bios settings for a setting about CPU fan check and disable if possible.

dangus 6th November 2009 05:52 AM

Bios settings, or use the speed signal from another fan in the system. Or use an oscillator to fake a signal.

Lumba Ogir 6th November 2009 07:55 AM

Hi guys,
Quote:

Are you trying to get the computer to not give you the "CPU fan fail" warning at boot?
Exactly.
Quote:

Look in the bios settings for a setting about CPU fan check and disable if possible
That´s not an option in this custom-made BIOS/MoBo.

I once solved the problem with a resistor between sensor and ground. It does not seem to work this time.

stinius 6th November 2009 09:09 AM

Hi

You will need a “Pseudo Fan” to fool the controller. The controller needs to see a square wave to “think” that the fan is running.

See July/August issue of Elektor page 17.

Link:

Cheers

Lumba Ogir 6th November 2009 09:21 AM

dangus and stinius,
interconnecting the sensors of system fan and processor fan (which is active) would be a simple enough solution.

wwenze 6th November 2009 11:45 AM

If you have an extra fan and your motherboard can use speedfan, just connect the extra fan and set speedfan to auto disable to fan after booting into Windows.

That's what I do anyway. My mainboard is also OEM with no option to disable CPU fan warning. And I have a Scythe Ninja to run fanless an undervolted A64 with.

Lumba Ogir 7th November 2009 09:06 PM

Hi,
no success yet, fan speed control is very problematic these days...
Fan Speed Control is Cool! - Maxim
http://pdfserv.maxim-ic.com/en/an/AN1784.pdf

stinius 7th November 2009 09:42 PM

Quote:

Originally Posted by Lumba Ogir (Post 1973425)
Hi,
no success yet

Hi

What have you tried so far without success?

stinius


All times are GMT. The time now is 11:57 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2