running a pc fan outside of a case

[Mark Phillips]

I had a similar problem with my laptop(Dell Latitude). The internal fan
kept running after an hour or so sitting on my desk. I bought a foam
wrist support for typing and put that under the back of the laptop. It
raises the back of the laptop about 5/8" off the desk. There is enough
air circulation under there now to keep the fan off. I also don't
install my battery until I need it - that open bay also allows more air
to circulate through the laptop (my assumption). 

The slight incline to the keyboard makes typing more comfortable as
well! When I travel, I have a laptop backpack, and I put the foam piece
under the laptop backpack - it gives it extra cushion on the bottom of
the backpack so when I set the backpack down on a hard surface I don't
jar the laptop. The best $5 investment for may laptop!

Mark

On Thu, 2008-08-21 at 02:38 -0400, fouldragon at aol.com wrote:
> 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
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> 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.
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> 
> 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
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> 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
> 
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> 
> On Wed, Aug 20, 2008 at 3:00 PM, Alex Dean <alex at crackpot.org> wrote:
> 
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> Eric Cope wrote:
> 
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> 
> 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.
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> 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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