Adding an RPM sensor to a fan?

[MikeHunt79]

Ok, this will be for a shuttle sn45g

The motherboard has 3 fan connectors on board, and the nice thing is, when a fan is plugged into the motherboard that has an RPM sensor, the motherboard can control the speed of the fan.

Now, if have an arctic cooling VGA silencer on my 9800 pro,which has a speed switch for the fan, high and low. Very crude. Now, if I could somehow add an RPM sensor to this fan, my shuttle could then control the speed, and it would have more than 2 levels. If this possible? i can easily cut and solder wires, but anything more and i'm not really sure what i'm doing.

 

[MikeHunt79]

I would buy a new fan if I could, but the VGA silencer uses a strange fan that you can't buy seperately... I'll try plugging it up to the motherboard and see if I can control the speed, but if it doesn't work, I guess I'll have to remember to flick the switch to change the speed.

EDIT: I'm using speedfan to control my fans, it works well for my 2 case fans already connected.

 

[MikeHunt79]

It is possible to open the cooler up by taking the screws out the shroud. I guess I'll try the adaptor or maybe just solder up the wires to a 3 pin plug I've got lying around somewhere. On high you can definately hear it tho, but I think that might be because the rest of the shuttle is pretty quiet. I still need to do some chopping up of the lid, because the cooler sticks out the case.