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Subject: Re: 12V computer fans run from 27 to 38V, speeding up at high temperature
Date: Wed, 23 Oct 2002 22:42:14 +0100
Organization: Kijoma Solutions Ltd
References: <firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: 25 Oct 2002 01:31:49 GMT
X-Newsreader: Microsoft Outlook Express 5.50.4807.1700
the LM2679 regulator should be ideal.
use a LM75 or DS75/ds1775 if you have a cpu around to provide the
also look out for heat pipe heatsinks which will make routing the heat away
a lot easier.
oh.. and how does a mixer work ? ;]
Kijoma Solutions Ltd
RF - Analogue - Digital - Software
Electronic Product Design & Consultancy
Email : news@kiSPjoAMma.com ( remove the spam)
There are only 10 types of the people in the world
those who understand binary and those who don't
"Winfield Hill" wrote in message
> firstname.lastname@example.org wrote...
> >Winfield Hill wrote
> >>> Thinking kindly on the hungry masses here at s.e.d., here's a bone
> >>> for yo'all to knaw on. I'd like to run various generic 12V computer
> >>> heat-sink fans from a 27 to 38V supply, using a PWM buck regulator.
> >>> The fan should run slowly at room temp, but increase to full speed
> >>> by ~ 40C heat-sink temperature. Full speed would be 12V fan drive,
> >>> which shouldn't be exceeded even if the temperature rises over 40C.
> > Have the manufacturers mount the processor(s) on the motherboard
> > underside and mount the motherboard vertically against the case
> > sidewall so as to press the processor against the (aluminum) case
> > via heat-sink compound.
> Nice thinking Robin, here's what my assistant is working on. Consider
> a small instrument box with 25 to 50 watts generated inside by a single
> TO-3 device, an APEX hybrid-circuit power amplifier. We'll transport
> the heat to outside the box, where there will be a standard computer
> heat-sink/fan attached to the rear panel.
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