[hpsdr] To suck or to blow, that is the question

[John Koster]

Yes, I was off lost in the woods somewhere.  Sorry.  Luis' original 
suggestion was what I was looking for now that I did a little of my own 
research.

On Sun, 12 Jul 2009, Ron Kolarik wrote:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> I'm pretty sure the third lead on those fans is a tachometer output, the MOBO
> uses it to sense speed and adjust up or down for temp.  Then again I may be wrong.
> 
> Ron
> k0idt
> 
> 
> > Message: 8
> > Date: Sun, 12 Jul 2009 00:21:14 -0500 (CDT)
> > From: John Koster <w9ddd at tapr.org>
> > Subject: Re: [hpsdr] To suck or to blow, that is the question.
> > To: Luis Perdomo <luisfp at gmail.com>
> > Cc: hpsdr at lists.openhpsdr.org
> > Message-ID:
> > <Pine.LNX.4.44.0907120018260.5085-100000 at localhost.localdomain>
> > Content-Type: TEXT/PLAIN; charset=US-ASCII
> > 
> > Good for a 'dumb' fan, but many of those I can buy at Fry's have a control 
> > lead which when left unterminated lets the fan run full speed.  If you 
> > have the right control voltage going to it, you don't need all the 
> > circuitry shown in your link.  Guess one needs to find the schematic of a 
> > Mobo and duplicate that circuit if it's not buried in one of the large 
> > ICs.  Perhaps it's a signal out of the processor these days?  
> > 
> 
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-- 
73,
John, W9DDD



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