amp fans

sriegel · 4th January 2002, 10:21 PM

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
scott

GRollins · 4th January 2002, 11:03 PM

Your question is rather open-ended. The answer will depend on what heatsink configuration you're using.

Grey

promitheus · 5th January 2002, 12:05 AM

As Grollins stated it depends on the heatsinks. If the heatsinks are on the outside of the enclosure it´s 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.

sriegel · 5th January 2002, 02:27 AM

aha!
i think i was going in the wrong direction. thanks guys, that makes a little more sense.
cheers,
scott

wuffwaff · 5th January 2002, 11:10 PM

Hi Scott,

I´m 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 won´t be a problem. The IC has some nice features you can set with different resistors (start up temp etc. see http://www.micrel.com)

william

4th January 2002, 10:21 PM	#1
sriegel diyAudio Member Join Date: Nov 2001	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 scott

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4th January 2002, 11:03 PM	#2
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Your question is rather open-ended. The answer will depend on what heatsink configuration you're using. Grey

5th January 2002, 12:05 AM	#3
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	As Grollins stated it depends on the heatsinks. If the heatsinks are on the outside of the enclosure it´s 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.

5th January 2002, 02:27 AM	#4
sriegel diyAudio Member Join Date: Nov 2001	aha! i think i was going in the wrong direction. thanks guys, that makes a little more sense. cheers, scott

5th January 2002, 11:10 PM	#5
wuffwaff diyAudio Member Join Date: Aug 2001 Location: Ingolstadt Germany	Hi Scott, I´m 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 won´t be a problem. The IC has some nice features you can set with different resistors (start up temp etc. see http://www.micrel.com) william

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