[Aleph5] Heatsink burn-in test - diyAudio
 [Aleph5] Heatsink burn-in test
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Pass Labs This forum is dedicated to Pass Labs discussion.

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
diyAudio Member

Join Date: Oct 2002
Location: Amsterdam
Blog Entries: 1
[Aleph5] Heatsink burn-in test

Hello there!

While we are collecting all our parts for our Aleph5's we came around some nice heatsinks measuring 33x18x38 mm. Perhaps we can use them? We gave it a try and connected 4 Caddock 9100 resistors (25 ohm / 100W) to it in parallel. We add a nice and cute PSU to them and fired the whole thing up.
Attached Images
 koelbloktest012lq.jpg (55.3 KB, 857 views)
__________________
The right tool for the right job, a very nice Solarboat || Ready for a groupbuy ? CLick

diyAudio Member

Join Date: Oct 2002
Location: Amsterdam
Blog Entries: 1
In order to calculate the thermal resistance we dissapated 100Watts in total devided over the four resistors and waited. After an hour we read a steady 53.1 'C. With an ambiant temperature of 23 degrees this means: 53.1 - 23.0 =~ 30 'C. @ 100Watts.
R(th) = 30 / 100 = 0.3 K/W.
Attached Images
 koelbloktest004lq.jpg (85.5 KB, 862 views)
__________________
The right tool for the right job, a very nice Solarboat || Ready for a groupbuy ? CLick

diyAudio Member

Join Date: Oct 2002
Location: Amsterdam
Blog Entries: 1
Now some fine calculus for beginners:

An Aleph5 dissapates 150Watts per channel, therefore we get 150 x 0.3 = 45 'C above ambiant. At 25 'C ambiant this means a surface temperature of 70 'C. Hmmmm.... This is quite hot!

Now to our question: is this TOO hot?

Having that nice PSU looking at us with its maximum ratings of 40V / 75 Amps we couldn't resist to fire the whole setup to the max. Putting 40 volts over those 25 ohms resistors this meant a total dissipation of 250Watts!
Attached Images
 koelbloktest018lq.jpg (66.1 KB, 826 views)
__________________
The right tool for the right job, a very nice Solarboat || Ready for a groupbuy ? CLick

diyAudio Member

Join Date: Oct 2002
Location: Amsterdam
Blog Entries: 1
And yet another pic: the PSU naked.

Maybe we could use this for another pass labs project in the future.
Attached Images
 koelbloktest021lq.jpg (90.0 KB, 842 views)
__________________
The right tool for the right job, a very nice Solarboat || Ready for a groupbuy ? CLick

 20th September 2003, 08:55 AM #5 diyAudio Member     Join Date: Sep 2002 Location: North of Boston too hot? You would be better off with two per channel or some fans. __________________ MikeW
Warp Engineer
On Holiday

Join Date: Oct 2001
Location: Queensland, Australia
Quote:
 Originally posted by Jaac TheMaster Now to our question: is this TOO hot?
IMHO Yes it is too hot. You should generally consider 55°C about as hot as you want to go and I certainly wouldn't go over 60°C.
__________________
- Dan

 21st September 2003, 08:33 AM #7 diyAudio Member     Join Date: Jul 2002 Location: Denmark - Jutland Hot Hot Hot Hi, I order for a product to go en the market, any surface may not exceed a temperature of more than about 50 - 55 degrees (Centigrade) this is the temperature where most people would not like to keep a hand or finger on the hot surface. IMHO: The semi's mounted on the surface would not like to be sitting at 70 degrees for 10 years. I reccomend to not have the sinks hotter than 50 - 55 degrees. Also you must think of the room temperature during summer might exceed 30 - 35 degrees (where I live we don't use air condition) \Jens
 22nd September 2003, 02:57 AM #8 diyAudio Member   Join Date: Jan 2003 Location: piedmont OTOH, 0.3°K/W is just perfect for a channel of Zen v4... ...where did you find this heatsink, and how much did it cost? /andrew
 22nd September 2003, 10:26 AM #9 diyAudio Member     Join Date: Oct 2002 Location: Amsterdam Blog Entries: 1 The Heatsinks where mounted on an switching power supply that we bought last winter in Rosmalen in the netherlands on a radio market (b.k.a. Veron ) for 7,50 euro each. The heatsink self is a special made i think because the fins aren't spaced the same over the lenght of the heatsink. gr jaac __________________ The right tool for the right job, a very nice Solarboat || Ready for a groupbuy ? CLick
 22nd September 2003, 11:44 AM #10 diyAudio Member     Join Date: Jul 2002 Location: Netherlands Did you test it like in the photo ?, if so redo the test with the heatsinks standing upright and with spacer between the floor and heatsink so you got maximum convention. You just made your heatsinks more efficient Ralph

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post mefinnis Pass Labs 57 2nd June 2005 01:10 PM Duck-Twacy Pass Labs 9 14th September 2004 03:11 PM PedroPO Pass Labs 11 21st November 2002 02:35 PM scrazy Pass Labs 2 30th November 2001 10:58 AM tom Pass Labs 2 26th November 2001 11:26 PM

 New To Site? Need Help?

All times are GMT. The time now is 01:34 AM.