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[bobmarley2021]

Ok, have decided to go for a 12v source and a Zalman FanMate 2. They are £3.95 on eBay, or there are cheaper clones from China.

[Grim187]

i know a lot of you are still cutting the + wire on the fans and just wiring it to a 12v spot on the board, altho this dose work there is an easier way that doesn't require modifying the fans.

for a lesser fan speed cut the ground of both fans and run both ground wires to a power source (after doing the 12v fan mod).
for 7v ground to this point: Xenon, Zephyr/Falcon/Opus/Jasper
for 9v ground to this point: Xenon, Zeyphr/Falcon/Opus/Jasper

Xenon:

Bottom of the Board:
Yellow=12v Black=CPU Red=GPU

(If your Having Trouble Understanding Click the Picture)
OR
Top of the Board:
Bridge Black for CPU, Bridge Red For GPU.



Zephyr, Falcon, Opus & Jasper:
The Zephyr, Falcon, Opus and Jasper Board have the same voltage line to both fans
so it wont be possible to 12 or 7v just one fan w/o cutting the wires.

Bottom of the Board:

OR
Top of the Board:


Note: Sunon and Nidec Fans have Reversed Power Wires.



Trinity/Valhalla:
Bottom of the Board:

Red=5v, Yellow=Fan Speed Control.
Bridge for Full Speed.
Potentiometer for Controlled speed.



If you plan to use a potentiometer to manually adjust the fan speed here is one
that is close to the right strength and here is how it should be used.

[brandogg]

That looks like a very easy mod to do, as well as a very easy mod to reverse if need be.  My system runs very cool now, but I may check that out as well, since it looks like it would be so easy to reverse if I couldn't handle the additional noise.

[G0t M4xx 21]

this is a very easy and safe way to do a 12V mod.

Basically, that transistor connects the fan line to 12V on and off many times a second, creating a voltage on the fan somewhere between 0 and 12v.

Shorting the transistor essentially turns it on 100% of the time, so the fans will be at 12V. It does no damage to the transistor, simply bypasses it.

This will also make your fans work if the transistor is blown (fans don't spin).

Another idea: if you put a potentiometer across the pins of the transistor, then you would be able to control how much you are "boosting" the fan speed. Potentiometer at highest resistance = stock fan speed, as it drops to zero the fans will speed up more and more, until resistance = 0 and the fans are at 12V.

[plowmanjoe]

i like this new info. i've been thinking of doing the 12v fan mod for awhile now and now i think i do this one but i have a few questions.

i want to have variable fan speed control using a potentiometer but i have no clue what kind to get. i'm looking at radio shack's web site and there's a bunch of different ones, does it matter what i get?

also, what is a good way/ location to place this potentiometer? i already have one on/off switch for my xcm core cooler mounted in the back and i had to take out some clips that hold the case together to make it work.

[tinker77]

Great info guys, thanks!!

[Eddie_the_Hated]

Very cool, it's far simpler than mucking about with the fan wires!

Thanks!

[Grim187]

QUOTE(plowmanjoe @ Jan 16 2008, 01:26 AM)

i like this new info. i've been thinking of doing the 12v fan mod for awhile now and now i think i do this one but i have a few questions.

i want to have variable fan speed control using a potentiometer but i have no clue what kind to get. i'm looking at radio shack's web site and there's a bunch of different ones, does it matter what i get?

also, what is a good way/ location to place this potentiometer? i already have one on/off switch for my xcm core cooler mounted in the back and i had to take out some clips that hold the case together to make it work.

a 5 or 1 k would be the best, im not sure you can find a 1k in the huge size, you want it to be as big as possible that way you can mount it inside but have a knob on the outside.

remember you can always cut the ground wires and put them to a 5v source to do the 7v fan mod (except on the v2 and v3 board)

which brings me to the v3 board, i finally got around to modifying the cooling system on a falcon i got in a couple months ago and it turns out if you wire the fans ground to 5v it will throw 0001, also the board is designed differently so the points to solder for 12v are different, if i have time i will take it back apart and take pictures, if not i will get some posted of the next one i get.

[tinker77]

I have a falcon board too, so I'll wait for you update. Meanwhile, you think I would safely be able to use "T-tap's" or "12V Case Fan Power Adapter" to do the 12v fan mod? ...both from llama.com, I like the T-tap's thingy but I don't know how well it works...What would u recommend?  Thanks in advance!

[plowmanjoe]

i did this mod with a 5k potentiometer earlier today. soldering to those points was really hard for me but i did it. it works and all but now how i want it to. turning the nob doesn't do anything until the end. and at the end it shoots up to full power. so there's not too much control. i'm thinking maybe i wires the potentiometer wrong. there's 3 spots on it to solder to. and i soldered the wires to the middle one and one of the outside ones. is that right? i just guessed, i'm not sure why there's 3 points

This post has been edited by plowmanjoe: Jan 18 2008, 07:18 AM

[ReaperX_BR]

I didn't understand the pics  

[Rictorious]

Heh, well im guessing a part of the motherboard is zoomed in, its location showed by the little red lines eg. on the top side of the board pic, the middle part is zoomed in and the 4 small red lines shows its location

And you just have to solder the area shown by the thick red line to create the bridge. Please correct me if im wrong though cause im a noob (IMG:style_emoticons/default/tongue.gif)

This post has been edited by Rictorious: Jan 18 2008, 07:42 PM

[tinker77]

A nice detailed tutorial of this mod for all the n00bz here would be awesome!...    

[Grim187]

QUOTE(tinker77 @ Jan 17 2008, 04:34 PM)

I have a falcon board too, so I'll wait for you update. Meanwhile, you think I would safely be able to use "T-tap's" or "12V Case Fan Power Adapter" to do the 12v fan mod? ...both from llama.com, I like the T-tap's thingy but I don't know how well it works...What would u recommend?  Thanks in advance!

don't use t-taps, if you really want to do it right now there's a big mosfet right around the same spot on the underside, just wire one of the legs to the head.

QUOTE(plowmanjoe @ Jan 17 2008, 10:45 PM)

i did this mod with a 5k potentiometer earlier today. soldering to those points was really hard for me but i did it. it works and all but now how i want it to. turning the nob doesn't do anything until the end. and at the end it shoots up to full power. so there's not too much control. i'm thinking maybe i wires the potentiometer wrong. there's 3 spots on it to solder to. and i soldered the wires to the middle one and one of the outside ones. is that right? i just guessed, i'm not sure why there's 3 points

if you want more control put the middle leg to the right side of the onboard transistor and get 12v and 5v from under the power connector that way you should be able to use the pet to go from 5v all the way to 12v.

[Grim187]

Update
Added: v3 Falcon, Simple 7v.


Dose anyone have high rez pix of the V2 Zephyr?