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Old 4th January 2002, 10:21 PM   #1
diyAudio Member
Join Date: Nov 2001
Default amp fans

greetings all,
i'm slowly building an aleph 5 and am interested in installing a small fan for each channel to evacuate as much hot air as possible. any ideas on where it's best to introduce these into the system? thanks in advance
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Old 4th January 2002, 11:03 PM   #2
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Location: Columbia, SC
Your question is rather open-ended. The answer will depend on what heatsink configuration you're using.

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Old 5th January 2002, 12:05 AM   #3
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Join Date: Jan 2001
Location: Germany
As Grollins stated it depends on the heatsinks. If the heatsinks are on the outside of the enclosure its not practicle to use a fan on them. To use a fan the heatsinks must form a tunnel through the air can flow. When this tunnel is closed from all around and has only 2 openings front and back, a fan on one side can do wonders. There are also ready made tunnels to buy for high power systems but are rather expensive. In each case you have to know from the begining or calculate the heat transfer you can obtain.
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Old 5th January 2002, 02:27 AM   #4
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i think i was going in the wrong direction. thanks guys, that makes a little more sense.
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Old 5th January 2002, 11:10 PM   #5
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Join Date: Aug 2001
Location: Ingolstadt Germany
Hi Scott,

Im also building (maybe even slower) an Aleph 5 with fans. I will use 4 Heatsinks (Fisher SK53 0,6 C/W) and two fans (120mm). I found a nice IC from Micrel (MC502) wich drives the fans dependent on heatsink temperature with a PWM signal so noise wont be a problem. The IC has some nice features you can set with different resistors (start up temp etc. see

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