I'd suggest you consider an AC fan with a series capacitor in one side or the
other of the supply to the fan. If you're ambitious, you can do quite a
little with that sort of hookup, trading off fan noise for effective cooling
power. If you put about 0.47uF in series with a typical small AC fan, it will
cut the torque considerably, and that will cut the amount of air it moves. If
you put a normally-open SSR, controlled by a temperature sensor in some
critical area of your enclosure, in parallel with the cap, then have the
control enable the SSR whenever the temp is above a certain point, it will
speed up the fan and keep running at high speed until the control signal goes
away. You then play with the hysteresis until you get satisfactory
performance.
Dick
----- Original Message -----
From: <philip_at_awale.qc.ca>
To: <classiccmp_at_classiccmp.org>
Sent: Tuesday, April 30, 2002 4:13 PM
Subject: Re: IBM AT power supply case/cooling question
>
> On 30-Apr-2002 Chad Fernandez wrote:
> > What I may do is poke a hole in the top of the case, and mount a big
> > fan. How well would a 24volt fan run on 12 volts? Since it's DC it's
> > fine, right? It's just slower?
>
> Try it! :)
>
> -Philip
>
>
Received on Tue Apr 30 2002 - 17:50:51 BST