Fan Startup Mod
Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee
Fan Startup Mod
First off,
Thanks MikeC. Great Website.
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My 140mm PS fan would run very quiet at 5v, but would not startup at 5v.
Added a startup capacitor
http://finance.ph.groups.yahoo.com/grou ... =1&m=f&o=0
Now starts and runs very quiet at 4.52v
Adding a startup capacitor helps for those fans that have startup problems, but run quietly at lower voltages.
Obviously, use at your own risk!
140mm fan
http://www.newegg.com/Product/Product.a ... 6835129249
Cut out the LED's and wired a 250 ohm potentiometer
Thanks MikeC. Great Website.
---------------------------------------------
My 140mm PS fan would run very quiet at 5v, but would not startup at 5v.
Added a startup capacitor
http://finance.ph.groups.yahoo.com/grou ... =1&m=f&o=0
Now starts and runs very quiet at 4.52v
Adding a startup capacitor helps for those fans that have startup problems, but run quietly at lower voltages.
Obviously, use at your own risk!
140mm fan
http://www.newegg.com/Product/Product.a ... 6835129249
Cut out the LED's and wired a 250 ohm potentiometer
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- Posts: 140
- Joined: Wed Jan 18, 2006 4:57 am
- Location: France, Lyon
Re: Fan Startup Mod
I can't access that link, a yahoo account is needed. Could you host the picture on www.imageshack.us ?krusty wrote: Added a startup capacitor
http://finance.ph.groups.yahoo.com/grou ... =1&m=f&o=0
Now starts and runs very quiet at 4.52v
What are the specs of the capacitor (and how did you choose them) ?
Can you tell what happen when you shut the computer off ? Does the capacitor unloads its load through the potentiometer, or does that get fed back to the PSU through the fan connector ?
He used a 3300 uF 35V capacitor across a 250-ohm pot, inline with the fan 12V line. The capacitor charges when power is turned on, drawing extra current through the fan. Once the cap is charged, the current drops and the fan slows down. When power is removed, the cap discharges through the pot.
Simple and elegant.
Simple and elegant.
Last edited by cmthomson on Sat Aug 19, 2006 2:43 pm, edited 1 time in total.
Fan Startup Mod at imageshack
http://img163.imageshack.us/img163/1598 ... modao6.gif
I think the 250 ohm pot in parallel with the cap will discharge it safely
when powered off, so I think it's safe. Been thru many power cycles.
However:
Disclaimer:
USE AT YOUR OWN RISK
I think the 250 ohm pot in parallel with the cap will discharge it safely
when powered off, so I think it's safe. Been thru many power cycles.
However:
Disclaimer:
USE AT YOUR OWN RISK