Possible way to make 12v USB powered fan??

You could probably get by with using a 5 volt fan or to:

http://www.frozencpu.com/cat/l2/g36/c231/list/p1/Fans-5...

If you aren't doing this as a side project of sorts, it would probably be easier to just go out and buy a cooling pad.

There are methods of converting lower voltage to higher voltages. The key point to note is that the total power output from a USB port is limited by the maximum current it can source.
A typical USB port can source max. of 500mA. At 5V that is 2.5Watts.
If you up-convert 5v to 12V the max current you could draw would be 208mA.
That's cause you cannot draw more than 2.5Watts of power from the usb port.

A typical 12V fan would require more than 2.5Watts of power to run.

Equations for reference
Power = Voltage x Current [Watts]

Looking for something like this?
http://www.meritline.com/laptop-cooler---c-7731.aspx

if you want to have your laptop in a desk or something, you could get two 12v fans and get and universal power source and plug it in... (i've done that).

First of all, thank you all for the quick reply!!!


What do you mean by a universal power source? Can you show me???

Universal Power Adapter