splicing a case fan

[fentoozler71]

i want to add an extra case fan to my system. since it is extra, i dont have any spots to plug it in, so i want to get a power suply that you would plug into the wall, similar to the one you might plug into your router, or charge an old cell phone with. yes, i know it has to be a 12v regulated supply cable. my question is this, the power supply has 2 wires, positive and negative obviously. the fan i want has four wires, positive, negative, sensor, and control. can i just solder the positive and negative wires together respectively and it will run at full speed, or will not plugging the two other wires keep the fan from spinning?

 

[TFT]

Just use the + and - leaving the other two to air, it will run at full speed. Be careful of the cable colouring, black is negative but sometimes yelow or red is used as positive.

 

[diduknowthat]

I don't know whether a 4pinned fan would work well in this case. They are PWM fans designed to run off pulses of power as to control their speed.