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3 fans + USB cord wiring help please

post #1 of 6
Thread Starter 
I am making a laptop cooler and I want to hook up three fans to a USB cable to plug into the laptop. Does any one know how to do this? If so please help,thanks.Each fan has 2 wires.
Old Skool Redux
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Old Skool Redux
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post #2 of 6


Connect VCC to the red wire on the fan and black to GND. Ignore the 2 inner pins. Also make sure the fans dont draw too much power...each USB slot can only put out like 2.5W.
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Very nice!
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post #3 of 6
Quote:
Originally Posted by J3r3my View Post
Connect VCC to the red wire on the fan and black to GND. Ignore the 2 inner pins. Also make sure the fans dont draw too much power...each USB slot can only put out like 2.5W.
Most PC fans have a start up voltage of 7v. If you want to do this, find a fan that will start/run on 5v. 2.5w is not much... I doubt you will be able to power 3 fans with one USB plug. Most fans use 1-3w depending on size and RPM.
Once again...
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Once again...
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post #4 of 6
very well said
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post #5 of 6
I have an MFC1 controller that has two 12/5 Volt switches on it and every fan I have ever connected to it has started at 5 Volts. My FM92 can start at under 3 Volts (running on 5V supply PLUS Pot turned all the way down) even tho on the box it says it needs 7 Volts to start.
    
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post #6 of 6
Thread Starter 
Thanks for the tips people!
Old Skool Redux
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Old Skool Redux
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