running a pc fan outside of a case

[fouldragon at aol.com]

The most you can reliably get out of a USB port is 500mA.

Typical fan draw varies wildly by size and performance level.  
100-200mA  at 12 volts is typical for 80/92/120mm "PC case" fans, but 
then there are a few rated as high as 900mA at 12 volts.  Of course, 
the 5v versions will draw more current for an equivalent performance 
level.



-----Original Message-----
From: Nadim Hoque <nadimhoque at gmail.com>
To: 'Main PLUG discussion list' <plug-discuss at lists.plug.phoenix.az.us>
Sent: Wed, 20 Aug 2008 9:25 pm
Subject: RE: running a pc fan outside of a case
























In terms of getting extra air or cooling your laptop more
efficiently, just yet a laptop cooler. Pick one up at fry’s for 20 
bulks. The
fan’s power is directly fed via the USB cable. Thermaltake has this one 
laptop
cooler that uses this weird past, but it’s supposed to cool down the 
laptop
passively. I don’t know the power usage of the USB ones, but do keep in 
mind
that you might be powering 2 fans at once. This way is far safer and 
cheaper
and don’t forget easier to just use a laptop cooler. Again Fry’s has 
them; just
ask a employee and they should guide you.



 






From: plug-discuss-bounces at lists.plug.phoenix.az.us
[mailto:plug-discuss-bounces at lists.plug.phoenix.az.us] On Behalf=2
0Of Eric
Cope

Sent: Wednesday, August 20, 2008 3:14 PM

To: Main PLUG discussion list

Subject: Re: running a pc fan outside of a case






 






exactly. Get a 5V DC supply and
solder it to the power lead on the fan. At 5 volts the fan will be 
slower and
quieter. If you need more air movement, get a 12V DC supply. The fan 
will move
faster, but be louder.



Depending on your notebook, you may have some fun experimenting with 
heat
pipes...



Eric






On Wed, Aug 20, 2008 at 3:00 PM, Alex Dean <alex at crackpot.org> wrote:






Eric Cope wrote:



Outside of that, some solder, a wall wart, and a 4-5" PC
fan would make a great air mover...

But given you lack of hardware knowledge, go with the above 
recommendations.



 






well, i do know how to solder.  just haven't done
anything inside a pc case since i was in highschool, and have never 
attempted
to do anything with a power supply.  but wiring a fan to a power brick i
could do...



a wall wart is one of those bricks that take up all the space on the 
power
strip, right?





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