searching for a wide alpha cpu heatsink (2nd request)

[Alexander Huemer]

Hoover, Tony wrote:
> Interesting.  All my LX's and SX (and even my EB64+, back in the day)
> all had 3 wire fans.  I thought it was required.  IIRC, You could use a
> PC fan, but you have to switch the power and tach lines (I think, check
> pin-outs before taking my word on that).  I remember that I did re-wire
> a PC fan for one of my alphas.
>
>
> I guess if you have something to generate psuedo-tach pulses, you could
> passively cool an alpha (with a large enough heat-sink).  I'll  be
> interested in hearing the outcome.
>
> If you know a machinist, you could have him build a heat sink for you
> out of a block of aluminum.  Remember, surface area is the key, so use a
> small mill to make lots of fins.
>
>
> Good luck
>
> T
>
> On Mon, 2008-11-10 at 17:59 -0500, Jay Estabrook wrote:
>   
>> Hi, Tony,
>>
>> He's looking to do this to an LX164, and mine only has a 2-wire fan,
>> so I think it may be OK?
>>
>> --Jay++
>>
>> Hoover, Tony wrote:
>>     
>>> You still have to have a fan.  Alpha's don't run if it doesn't detect
>>> pulses on the tach line for the CPU fan.
>>>
>>> T
>>>
>>>
>>> On Mon, 2008-11-10 at 18:35 +0100, Alexander Huemer wrote:
>>>       
>>>> Marc Schlensog wrote:
>>>>         
>>>>> On Mon, 10 Nov 2008 17:00:18 +0100
>>>>> Alexander Huemer <alexander.huemer at sbg.ac.at> wrote:
>>>>>
>>>>>
>>>>>           
>>>>>> hi,
>>>>>>
>>>>>> i got some offers from several people here on the list.
>>>>>> thanks a lot for that!
>>>>>> some people said they wanted to take a look in their basements or the
>>>>>> like. so, here is my second request: does anybody have a WIDE alpha
>>>>>> heatsink for me?
>>>>>> wide means > 5.5cm or 2.2in.
>>>>>> ideal would be somethink like
>>>>>> http://www.tbcs-online.de/e-bay/CPU/KN610-CA_SMP_1.jpg
>>>>>> that should be ~10cm or 3,9in wide.
>>>>>>
>>>>>>             
>>>>> What are you trying to do? Turn your LX into a space heater?
>>>>>
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>>>>>
>>>>>           
>>>> no, i am trying to cool my alpha with less noise.
>>>>
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>
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hi tony,

i have a 3 wires too.
re-wiring a pc fan is not possible to my knowledge, because the signal 
is completely different.
a pc wants to have pulses (as you said) so that they can measure the 
rotating speed of the fan.
the original fan of my alpha (some strange panaflo) gives a certain 
voltage on one wire if the fan is turning. when you stop the fan, the 
voltage goes up and the alpha stops. when you remove the fan, the 
voltage is missing and the alpha does not run either.

my "alpha fan simulator" does just provide the required voltage, that's all.

building a heatsink from scratch is of course possible, but that's not 
the way i want to go, if i find somebody who has a BIG BIG heatsink for me.

-- 
regards
alex