The Dell XPS m1530 has always been notorious for running hot. I'd like to build a custom laptop stand that incorporates a fan to help keep things cool.
But I want to do something more...
I want to know if I can power a fan from two usb ports. I would like to be able to have a fast/slow toggle and IIRC a usb port only outputs at 5v. So I would like to be able to have a 5v/10v switch...you know, for when I need a lot of air flow in a hurry...
I know they have such cables for hard drives, but would it work (or be advisable) for a toggled fan?
Thanks for any help! Have a great day!
OK, few problems here with the concept. Yes, the USB ports offer some 5 volt power, with very limited current. However, it is all the same 5 volt power meaning you can't in any way, shape, form or manner do a 5 + 5 = 10 Volts trick. Since the source is the same you just can't do it.
Next problem is yes, they do make 5 volt fans. However, these fans are generally very small and produce at best a breeze.
Now, as was mentioned, the USB ports have limited current. For certain devices that demand it, on some motherboards, they can deliver up to 500 mA (0.5 Amp). This is only available on boards supporting it and the device must request it.
A simple, accidental short of the 5 volts on a USB port can kill the port, as in really bad things can happen. That is the sole main reason I never advocate people plugging in home brew devices to a USB port.
Just My Take