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Help with 12V and 5V.

post #1 of 22
Thread Starter 
Desperate times call for desperate measures.
My office is stuffy and I need a fan. But because I'm on a reaaaaaaaaaaaally tight budget, I've decided to dive into my extensive collection of fans in hope of finding a 12V fan that works best on a USB output of 5V 0.5A

Some input please - assuming factors such as blade design and weight are unimportant.
Which motor would be best suited to take advantage of that full 5V 0.5A output?

Am I right in saying that a fan rated for 12V 0.3A will run at 5V 0.3A when connected via USB and hence I should be finding a fan that's closest to 0.5A, or are other factors to be taken into account as well?

I remember learning something about this in engineering class (I am, after all, an EEE graduate) but in Singapore you study for the sake of exams.
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post #2 of 22
I don't understand ??

Max USB power output = 500mA (0.5A). This is 2.5 watts at 0.5v (from4,75v to 5,25v).

Found this?
Quote:
USB only has 5V, so it cannot power a 12V fan....
The fan will spin at a very slow speed, or not at all.

A device designed for certain voltage will not work at a lower or higher voltage, the real world is different than the formulas on paper.

Plug a 12V fan into 24V and it will smoke and burn. Plug it into 5V and it will spin very slow or not at all.
Plug any 110V US appliance into 230V European power outlet and it will burn.
Plug any European 230V appliance into a US 110V power outlet and it will not run.

Edited by KaRLiToS - 3/27/13 at 6:45pm
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post #3 of 22
Theoretically it will run at less amperage than it would with 12 volt if hooked up to a 5 volt circuit.

It'll spin slow, if it spins at all. Other things will change the amperage on the fan though, thats why I said theoretically.
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post #4 of 22
Thread Starter 
Quote:
Originally Posted by Blooddrunk View Post

Theoretically it will run at less amperage than it would with 12 volt if hooked up to a 5 volt circuit.

It'll spin slow, if it spins at all. Other things will change the amperage on the fan though, thats why I said theoretically.

Yep, definitely it'll spin slow.

I'm looking to maximise the amperage even though the voltage can't run the fan at full speed.

Going to have to dig deep to find a fan that's decently large and quiet while still being able to move enough air.
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post #5 of 22
Quote:
Originally Posted by Volvo View Post

Yep, definitely it'll spin slow.

I'm looking to maximise the amperage even though the voltage can't run the fan at full speed.

Going to have to dig deep to find a fan that's decently large and quiet while still being able to move enough air.
There isn't many ways to do that I don't think. The fan will use enough amperage it needs until the supply limits it. Which is why if you get a large fan, it will probably consume more amperage at first than a small fan. More mass = harder to get going. So your fan may draw a lot of amperage initially, but decline once it builds momentum.

Best example is when you have a desk fan that is worn out, and you tap it once or twice to get it going then it spins fine afterwards. When you first start that worn fan up, you should hear a humming noise of the fan pushing a lot of amperage through it to get it going.
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post #6 of 22
Thread Starter 
Quote:
Originally Posted by Blooddrunk View Post

There isn't many ways to do that I don't think. The fan will use enough amperage it needs until the supply limits it. Which is why if you get a large fan, it will probably consume more amperage at first than a small fan. More mass = harder to get going. So your fan may draw a lot of amperage initially, but decline once it builds momentum.

Best example is when you have a desk fan that is worn out, and you tap it once or twice to get it going then it spins fine afterwards. When you first start that worn fan up, you should hear a humming noise of the fan pushing a lot of amperage through it to get it going.

Yep, got that.

I've got a Lian Li 140mm 2BB with blue LEDs just lying around after I had it replaced with a much stronger D14BH-12.

I think I'm going to give that one a shot. It does, afterall, have ball bearings so it will be easier to spool up.

And if that doesn't work then I'll proceed with using a 12V adapter on that one. Let's be honest, it doesn't scream at all.


EDIT: This morning's fan of choice is an AFB0712HHD. While it works pushing a light breeze to my face, a "light breeze" isn't enough.

NEED MOAR CFM.
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post #7 of 22
Quote:
Originally Posted by Volvo View Post

Yep, got that.

I've got a Lian Li 140mm 2BB with blue LEDs just lying around after I had it replaced with a much stronger D14BH-12.

I think I'm going to give that one a shot. It does, afterall, have ball bearings so it will be easier to spool up.

And if that doesn't work then I'll proceed with using a 12V adapter on that one. Let's be honest, it doesn't scream at all.


EDIT: This morning's fan of choice is an AFB0712HHD. While it works pushing a light breeze to my face, a "light breeze" isn't enough.

NEED MOAR CFM.
If it was me, since my PC is under my desk I would just run a 4 pin out the case and up. Then I could just put the fan on my desk. Though I have a nice desk fan already, just depends how hot it gets this summer.

140mm might be slightly big.
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post #8 of 22
Quote:
Originally Posted by Volvo View Post

Yep, got that.

I've got a Lian Li 140mm 2BB with blue LEDs just lying around after I had it replaced with a much stronger D14BH-12.

I think I'm going to give that one a shot. It does, afterall, have ball bearings so it will be easier to spool up.

And if that doesn't work then I'll proceed with using a 12V adapter on that one. Let's be honest, it doesn't scream at all.


EDIT: This morning's fan of choice is an AFB0712HHD. While it works pushing a light breeze to my face, a "light breeze" isn't enough.

NEED MOAR CFM.

Yeah run it from 4 pin molex or from 3 Pin fan directly from your PSU. Do a customize wire lenght with 18awg cable.

You only need +12v and Ground cable. No need for the yellow one with the 3 pin.. (Unless you want to control it)





(I once plugged my Pumps by mistake on the +5v and Ground on a molex and they didn't spin at all. Usually fan controller are suppose to control from 7v to 12v. And sometime at 7v the fan don't spin at all.)
Edited by KaRLiToS - 3/27/13 at 7:13pm
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post #9 of 22
Thread Starter 
Yep, I know that.

Just wondering about the principles of electrical works.

Just realised the PC here has removable slot covers so what I'll do is just run the LL off a molex. Welp.
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post #10 of 22
Quote:
Originally Posted by Volvo View Post

Yep, I know that.

Just wondering about the principles of electrical works.

Just realised the PC here has removable slot covers so what I'll do is just run the LL off a molex. Welp.
Luckily learning automotive has indirectly made me better at computer electronics. They both use 12 and 5 volt. lol.
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