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how should i connect two/three DC fans to 5 v USB supply ? to make laptop cooling pad. Answered

hi, i'm trying to make, laptop cooling pad as own.

hope it will help many members here,

my concept  - i want to connect 2/3 DC fans(axial box fans, generally finds in computer cabinet) & through USB connector,
i want to join it to laptop.for a cooling purpose.

but, now i am simply using 1 fan to 5 v usb right now.(i had tried 2 fans at one connection but another fan goes slow, so not confident about this experiment)

can you guys help me fast.

Some Points to Consider - fans which are going to connect 5 v USB connection should not Exceed 500mA. (heard that USB should not drawn more power than it. & should not be hectic to laptop battery but still very effect).

please explain here in detail.

Discussions

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mpilchfamily
mpilchfamily

5 years ago

What fans do you have? How much voltage and current do they draw?

You will need 5V fans to run off USB. As you already know USB only output a max of 500mA. In general it's about 400mA. So it's just a matter of finding the right fans that are 5V

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goldmine
goldmine

Reply 5 years ago

Hello,

ok, but How to make Connection in between them(if i want to connect 2/3 such fans) ? & are specified fans should run at same time.

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mpilchfamily
mpilchfamily

Reply 5 years ago

You connect the fans in parallel. So if you have 3 fans that draw 100mA, when they are in parallel they will draw a total of 300mA.