Page 1 of 4 1234 LastLast
Results 1 to 10 of 37
  1. #1
    They call me David... The_End_Of_Reality's Avatar
    Join Date
    Oct 2005
    Location
    Wellington
    Posts
    2,849

    Default Fan Cool Down Timer.

    Hey People

    I am doing a little modding and I want to be able to have some of the case fans and CPU fan and possibly GFX card fan running for 5~10 mins after shutdown, Now I know this will entail some electronics (I have seen a fan cool down timer that only does 2 fans(but I would like to build one )) the amount of fans would vary from 4 case fans, CPU fan, PSU fan, GFX card (if possible) (total of 7) to all case fans (7), CPU, PSU and GFX card (total of 10) just to cool down the componants better

    I know I will need to use some sort of gate system, XOR maybe, but how will I be able to get the required current?

    What voltage should I use, 5V Standby?

    Thanks
    Quote Originally Posted by Me
    It's a harddrive you idiot!

  2. #2
    Senior Member
    Join Date
    Dec 2004
    Posts
    966

    Default Re: Fan Cool Down Timer.

    You can make your own. Using a thermostat and power it up externally.
    * i7 930 & Corsair H70 Hydro Cooling
    * Asus P6X58D Premium
    * 3 x 2GB DDR3-1600
    * 1X 1 TB, SATA 6 Gb/s + 1X SG 320 Sata 3 GB/s
    * Unknown SATA DVD/RW
    * Corsair 850W PSU
    * Asus 1GB EAH5850
    * Windows 7 64Bit
    * MS Security Essential

  3. #3
    They call me David... The_End_Of_Reality's Avatar
    Join Date
    Oct 2005
    Location
    Wellington
    Posts
    2,849

    Default Re: Fan Cool Down Timer.

    True, but I want to have it on a timer, like this (if possible)

    How would I power it externaly?

    AND how would I get it to only turn on when the PC is turned off?
    Quote Originally Posted by Me
    It's a harddrive you idiot!

  4. #4
    tweakedgeek tweak'e's Avatar
    Join Date
    Dec 2004
    Location
    winterlessnorth (well almost)
    Posts
    4,943

    Default Re: Fan Cool Down Timer.

    the simply way would be to simply use a backup battery. ie it simply powers the fans after the main power is turned off. not hard to build a charging ciruit (plenty of kits or ready made chargers) that dosn't over charge. the only catch is makeing it so the battery dosn't drain to low (ie shuts off when down to 11 volt) or use a timer (plenty of kits for those) to let it run for a few minutes.
    Tweak it till it breaks

  5. #5
    Smiling Down On Youse SurferJoe46's Avatar
    Join Date
    May 2005
    Location
    Hamilton, Montana, USA
    Posts
    14,317

    Default Re: Fan Cool Down Timer.



    Warum werden wir so früh alt und klug so spät?

  6. #6
    They call me David... The_End_Of_Reality's Avatar
    Join Date
    Oct 2005
    Location
    Wellington
    Posts
    2,849

    Default Re: Fan Cool Down Timer.

    Joe, I saw that, but it only allows the use of 2 fans after power off

    (there was a link to the exact same product in my last post )
    Quote Originally Posted by Me
    It's a harddrive you idiot!

  7. #7
    Smiling Down On Youse SurferJoe46's Avatar
    Join Date
    May 2005
    Location
    Hamilton, Montana, USA
    Posts
    14,317

    Default Re: Fan Cool Down Timer.

    That's why like to C/P the whole link into the post..it makes it easier to cull the repeats..but I was thinking in your favor anyway...np


    Warum werden wir so früh alt und klug so spät?

  8. #8
    They call me David... The_End_Of_Reality's Avatar
    Join Date
    Oct 2005
    Location
    Wellington
    Posts
    2,849

    Default Re: Fan Cool Down Timer.

    Oh, yes I see what you mean

    I just like to build something rather than buying it, even if it costs more
    Quote Originally Posted by Me
    It's a harddrive you idiot!

  9. #9
    Senior Member
    Join Date
    Dec 2004
    Posts
    3,082

    Default Re: Fan Cool Down Timer.

    Why? A PC isn't anything like a turbocharged engine where you have a red hot turbo that needs lubrication until it cools down.

  10. #10

    Default Re: Fan Cool Down Timer.

    First, I would power the main circuit off rechargeable battery/ies. This would be automatically charged via constant current from the 12V line in the computer.

    To do the job correctly the circuit will have to be electronically in two parts. The first part will power the fans while the computer is running and the second part would be the timer circuit. The first part could be quite simple however.

    A Opto Coupler could be used to monitor the 12V line. Once this turns off, it would trigger a one-shot long delay CMOS timer. This in turn would drive either a relay or power transistor/s (as required) which would turn on your fans for about ten minutes. This would not be a high precision timer but should be close enough for your purpose. If you understand this, who needs a nerd test, you are one!!

    Now here's the good part, you could build the whole shooting match, (not counting the battery) for approximately $20-$30.

    If you want to send me a private message then I'd be happy to help you design a circuit.

    BURNZEE
    Last edited by Burnzee; 28-05-2006 at 07:51 PM.

Similar Threads

  1. Timer
    By laussie in forum PressF1
    Replies: 2
    Last Post: 29-07-2005, 10:44 PM
  2. first timer
    By pooloo in forum PressF1
    Replies: 4
    Last Post: 23-03-2005, 08:39 AM
  3. Minute Timer, XP
    By Poppa John in forum PressF1
    Replies: 7
    Last Post: 12-10-2003, 07:08 PM
  4. PC Timer
    By in forum PressF1
    Replies: 3
    Last Post: 31-05-2002, 04:29 PM
  5. Timer Disconections
    By in forum PressF1
    Replies: 3
    Last Post: 09-04-2002, 08:27 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •