Pictures of your diy Pass amplifier - Page 43

Zen Mod · 20th November 2010, 06:35 PM

Quote:

Originally Posted by vitalica

More details

......

why you choose to use styrofoam between your mosfets and heatsink ?

EUVL · 20th November 2010, 08:03 PM

> why you choose to use styrofoam between your mosfets and heatsink ?

For once, I like your sense of humour.
Quite british, this one.

Patrick

Zen Mod · 20th November 2010, 08:42 PM

....

Salomon · 09:26 PM

Quote:

Originally Posted by mrivera982

I need that type of heat sinks. Where did you get them? That cabinet its looking really good.

I know, that you want to get the typ of heatsinks from vitalica.
But I will try to help you.

Maybe I use the same heatsinks you have seen in #389, but not so high.
My heatsinks are from seifert electronic >> KL-274
500 x 200 x 84mm 0,1K/W

Seifert-Electronic - Produkte
See my screenshot of the datasheet

You also get similar products from fischer electronic
See PDF Attachment

Sorry that I have only the german data.

Salomon · 20th November 2010, 09:19 PM

Quote:

Originally Posted by Zen Mod

why you choose to use styrofoam between your mosfets and heatsink ?

Your heatsinks get not so hot!!

I have really much fun here.

mrivera982 · 20th November 2010, 09:31 PM

fantastic information. thank you so much. Your help is very much appreciated.

EUVL · 21st November 2010, 06:07 AM

Salomon,

Firstly very kind of you to put up the link to Seifert. I have used them for years, and am a satisfied customer.

However, I wish to point out that the optimal height for these sinks are not necessarily 200mm. These welded fin heatsinks (whether from Seifert or Fischer) has a 12.5mm fin pitch (as opposed to many extruded sinks with 10mm pitch). The increased pitch reduced air flow resistance between fins substantially (by almost a factor of 2). Hence there is still substantial performance gain going from 200mm to e.g. 400mm. One can see that from the graph you attached in post #424. Whether it is necessary or not depends on how much heat you want to dissipate or how low a temperature you want on the sinks. Of course they cost more with a 400mm height.

Patrick

korben69 · 21st November 2010, 01:08 PM

Hi all

Not a real finished amp BUT it's working !
Thanks to all especially to Mr Nelson PASS, BrianGT and to all the other folks who gave me a helping hand

New Aleph Mini PCB GB

Phill · 27th November 2010, 05:09 PM

hello
I am a huge fan of these amps!!!
ZenV9

Phill · 27th November 2010, 05:12 PM

Aleph 5

27th November 2010, 05:09 PM	#429
Phill diyAudio Member Join Date: Nov 2003 Location: France dand le sud	hello I am a huge fan of these amps!!! ZenV9 __________________ small handyman

27th November 2010, 05:12 PM	#430
Phill diyAudio Member Join Date: Nov 2003 Location: France dand le sud	Aleph 5 __________________ small handyman

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20th November 2010, 08:03 PM	#422
EUVL diyAudio Member Join Date: Oct 2003	> why you choose to use styrofoam between your mosfets and heatsink ? For once, I like your sense of humour. Quite british, this one. Patrick

20th November 2010, 09:31 PM	#426
mrivera982 diyAudio Member Join Date: Aug 2010 Location: Hawaii	fantastic information. thank you so much. Your help is very much appreciated.

21st November 2010, 06:07 AM	#427
EUVL diyAudio Member Join Date: Oct 2003	Salomon, Firstly very kind of you to put up the link to Seifert. I have used them for years, and am a satisfied customer. However, I wish to point out that the optimal height for these sinks are not necessarily 200mm. These welded fin heatsinks (whether from Seifert or Fischer) has a 12.5mm fin pitch (as opposed to many extruded sinks with 10mm pitch). The increased pitch reduced air flow resistance between fins substantially (by almost a factor of 2). Hence there is still substantial performance gain going from 200mm to e.g. 400mm. One can see that from the graph you attached in post #424. Whether it is necessary or not depends on how much heat you want to dissipate or how low a temperature you want on the sinks. Of course they cost more with a 400mm height. Patrick

21st November 2010, 01:08 PM	#428
korben69 diyAudio Member Join Date: Nov 2006 Location: Lyon	Hi all Not a real finished amp BUT it's working ! Thanks to all especially to Mr Nelson PASS, BrianGT and to all the other folks who gave me a helping hand New Aleph Mini PCB GB