Using Cpu Fan For Another Purpose

[espookid]

I want to use the fan from an old computer to just circulate the air ,the thing is it has four wires red green blue and black and I have connected the six permutations of single wires to a battery charger but it doesn't run .can anyone help?

[Old_Geezer]

If it has a label I'd try searching for info on the fan on the Net.
Failing that, if there's a standard a fan websearch might uncover something anyway.

[bhg481]

12 combinations if you take polarity into account. Have you tried both polarities?

[Old_Geezer]

Matter of interest. Is the a CPU fan or one fixed to the PC case ?

[jomifl]

It is probably a stepping motor for accurate speed control which will need a multiphase supply. Look for a fan with 2 wires.

[Old_Geezer]

http://www.allpinouts.org/index.php/Motherboard_(CPU)_4_Pin_Fan

[espookid]

thanks BHG of course I forgot that but I did check the voltage was correct
I thought being a dc motor the polarity didn't matter
but off to try now

[bhg481]

Look at OG's link first.

[Old_Geezer]

http://www.pavouk.org/hw/fan/en_fan4wire.html
Sense just seems to be a way to monitor it's running.

[espookid]

well tried again and no luck but did try an old sky box fan and that with two wires worked fine ,was just a little too small I will carry on searching but thanks for the help

[jomifl]

a useful link O_G :-)

[bhg481]

You can buy a new one for about £5.