Re: temperature controlled pc fan

["Paul Robinson" <ukcueman@xxxxxxxxxxx>]

ok, thanks Ian

----- Original Message -----
From: "Ian Davidson" <ian@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Saturday, July 03, 2004 8:35 AM
Subject: RE: [ukha_d] temperature controlled pc fan


> Hi Paul
>
> Just buy a thermostat from your electrical supplier. They do sell them
the
> opposite way around to normal heating type stats. Just a pair of
contacts
> close at what ever temperature you set. We use them in our transmitter
racks
> and we also have a large fan switched on one of these to circulate the
air
> in the building if the temperature rises to high.
>
> Ian D
>
>
> > -----Original Message-----
> > From: Paul Robinson [mailto:ukcueman@xxxxxxx]
> > Sent: 03 July 2004 02:16
> > To: ukha_d@xxxxxxx
> > Subject: [ukha_d] temperature controlled pc fan
> >
> > My node zero is in the loft. On the hottest days, it's too hot in
there
> for anything to
> > work reliably. So I have a rack which has a PC fan installed in
the back,
> with a duct to
> > the soffet where I hope (once it's running) it will be able to
pull in
> sufficiently cool
> > air to keep the air in the rack cool enough. What I'd like to do
now is to
> have this
> > switched so it's either on only when the temperature is above
some
> threshold, or so that
> > the speed changes with the temperature.
> >
> > I've found a suitable kit on maplin's (http://tinyurl.com/yt4yc) for
> on/off control, and a
> > circuit for speed control
> (http://www.overclockers.com.au/techstuff/a_thermalfans/),
but
> > does anybody know of a product in non-kit form so I can leave the
> soldering iron in its
> > box?
> >
> > Thanks,
> > Paul