Re: gEDA-dev: fans?

[Tomaz Solc <tomaz_dot_solc-at-NOSPAMtablix_dot_org>]

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Hi

> anyone have a good source for DC fans?  I need to replace a Delta 
> ASB0912H which is a DC brushless fan, 12V, 0.30A.  There is also a 
> "-FOO" on the label.  It has 3 wires so my guess is one is maybe a 
> speed  sensor.
>
> I've looked at Jameco, All Electronics, Digikey, and Mouser, and 
> Googled a bit.  If I could even find some more specs (like the pinout, 
> how the sensor pin works, and CFM) maybe I could find a replacement of 
> a different type.
>
> The computer this goes in needs the speed sensor.  In fact thats what 
> let me know the fan had failed.  I guess I could hotwire it but I hate 
> to bypass the monitoring

I've seen a lot of DC fans from different manufacturers. They all seem 
to be more or less identical inside: a simple circuit consisting of two 
transistors, some resistors and a Hall sensor. The only thing that 
varies is the pinout of the connector - but that is easy to correct. 
Red and black wires are for power and the third (usually yellow) is the 
sensor.

The sensor pin is connected to the output of the hall sensor. It gives 
a square wave with the same frequency as the fan.

I'm quite sure any 12V DC fan will work fine with your computer.

Best regards
Tomaz
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