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@gmail.com>
To: 'Main PLUG discussion list' <
plug-discuss@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@lists.plug.phoenix.az.us
[
mailto:plug-discuss-bounces@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@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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