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Old 28th May 2004, 08:18 AM   #11
Gubby is offline Gubby  Belgium
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Angry Barbecue

First of all many thanks to Mr Pass for joining this discussion...

BUT today I'm not happy !
Yesterday I made a first test of my Zen amp (cooled by Zalman heatsinks + Papst fans) with the case closed.
After an hour of nirvana listening rock music at high volume , I played a classical (Chopin) CD. Of course the sound pressure was lower and I began to hear the fans noise (spinning at high high speed).

Then I tried to low this speed and it was perfect......during 10 minutes...and suddenly no more left channel !!!

I opened the cased, put my finger on the IRFP240 heatsinks !

OK ! I'm stupid ! But I was so "bewitched" by the music...I forgot to check the temperature...

And I think I made a big mistake and this is also my

question:

My 2 fans extract the air from the case inside to the outside (I made also 2 extra holes for the air flow from the outside), don't you think it should be a better idea to invert the air flow (from the outside to the inside) ? or 1 fan importing the fresh air and 1 fan extracting the hot air ?
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Old 28th May 2004, 08:53 AM   #12
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This issue is often discussed on the PC overclockers forums.
Normally, a CPU cooler is designed to "drag" air from the inside to the outside of the case. But it is possible that the opposite direction is more effective.
You should give it a try while you measure the heatsink temperature.
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Old 28th May 2004, 12:43 PM   #13
Gubby is offline Gubby  Belgium
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....one thing I forgot to mention: the Zalman stock fan (provided with the heatsink) push the air to the heatsink !
So this is why I suppose it should be better...
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Old 28th May 2004, 04:51 PM   #14
Anorgan is offline Anorgan  Croatia
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As advised by HBarske, go to an overclocking site and read all there is on cooling. The idea is to keep the air flowing through the case. So try to use 12cm fan blowing out, and the same one blowing in from the other side. If you put those fans on a low voltage, you'll still have enough CFM (airflow) for cooling. Here are some links:

http://www.overclockers.com/topiclist/index09.asp#CASE COOLING
http://www.webx.dk/oz2cpu/pcmod/water.htm - here's something for watercooling - water running through zen amp -
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Old 2nd June 2004, 09:03 AM   #15
Gubby is offline Gubby  Belgium
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Lightbulb 1 blowing in & 1 blowing out

This is the solution !

1 fan blowing in the fresh air & 1 fan blowing out the hot air !
Now I can touch the CPU heatsinks with my finger without any risk for my integrity...and the voltage of the fans is quite low.

And the sound !!!! Waaaaw ! I tried to use my Vincent KVH111 headphone amp (valve amp) as preamp and the result is marvelous, even better than with my BOZ... (price~ 450 Euro in Europe - picture below)

Pictures of my Zen are coming.
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Old 2nd June 2004, 09:06 AM   #16
Gubby is offline Gubby  Belgium
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Default a german valve headphone amp driving my Zen

this is my headphone amp...
But OK it's out of scope....
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File Type: jpg khv111bg.jpg (13.1 KB, 882 views)
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Old 5th June 2004, 10:46 AM   #17
Gubby is offline Gubby  Belgium
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Talking Picture of my Zen !

And finally the picture !
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Old 5th June 2004, 10:52 AM   #18
Gubby is offline Gubby  Belgium
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Talking and the power unit...

2x34 V
300 VA
4x22000 uF
soft start circuit
2 selfs

(I made one change after I made the picture: on the picture this is a -34V/0V/+34V and now this is a +34/0/+34V)
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Old 7th June 2004, 07:02 PM   #19
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I'm waiting the arrival of the Zalman "Resorator" water
cooling towers for one of my Zens. No doubt it will become
one of the articles.
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Old 7th June 2004, 07:13 PM   #20
Anorgan is offline Anorgan  Croatia
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I saw those - they should cool stuff realy good.
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