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Help Please with powering small fans

BenBilly

Apr 24, 2015
5
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Apr 24, 2015
Messages
5
OK so I have a project in mind, basically when I'm playing games on my PC my hands tend to get really warm and sweaty so basically I have found two small fans these ones to be specific: http://www.ebay.co.uk/itm/321636289103 which I want to wire to a USB cable and make into little hand coolers. So basically I know that my USB can output 5V and 900mah so I will wire my fans in parallel because if I have my circuit rules correct then the current will be split and voltage will stay the same. Basically I want to add a variable resistor but I have no idea what size could you advise also will I need another resistor in my circuit?

Thanks,

Ben
 

HellasTechn

Apr 14, 2013
1,559
Joined
Apr 14, 2013
Messages
1,559
The fans in parallel will both draw the current they need to operate and voltage will be 5 volts. your usb port will be fine.

I think you will need a potentiometer of 100 Ohm to reduce speed of the fans.

the + of your fan connected to the middle pin of the potentiometer and the + of your usb port to any one of the two potentiometer pins left. Connect the third potentiometer pin to the - of your usb port together with the - of your fans.

Hope this helps.
 

BenBilly

Apr 24, 2015
5
Joined
Apr 24, 2015
Messages
5
And finally can I use a 1K Ohm potentiometer as I cannot find ones at 100 ohm's
 
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