compact aleph5 with cpu heatsinks finished

fheanor · 7th February 2005, 04:33 PM

Hello!!!

Well, this is my version of the aleph 5. The case is a standard aluminium 19" rack, and the mosfets are cooled by 4 cpu heatsinks.
The result is a very compact aleph 5, light, and cheap to build (this is the most important point for me

). The fan speed is adjustable, and if you want a very, very low air flow noise, the amp will run hot

.

The sound is very good!!

Big thanks to Mr Nelson Pass and diyaudio!

No exotic parts.

600 Va trafo
80000uf
mkt mundorf caps
Kristijan pcb's (thanks!)

next step: upgrade the psu with more uf and a LcLc filter

azira · 7th February 2005, 06:36 PM

Very clean implementation. What is your cover going to look like to provide for the air flow?

moe29 · 7th February 2005, 11:04 PM

That's one way to get around huge heatsinks!

What are you using to power the fans? Can you keep reducing

fan speed until you get it as quiet as you can with enough cooling?

thaks for sharing.

fheanor · 8th February 2005, 12:05 AM

hi again

Thanks Azira, I am planing to use a drilled aluminium cover (maybe the fans won't be covered..) . Something like this

Moe29, I use a small transformer to power the fans ( around 9 volts) and resistors to adjust the fan speed.

I've reduce the fan speed until I'm not able to hear any air flow noise from my listening position. At this point you can touch the heatsinks during 6 or 7 seconds

... you can keep reducing the fan speed ( specially if you listen music at night at low volume ), but i don't recomend it... the mosfets will die too young .

.

Bill Fitzpatrick · 8th February 2005, 01:53 AM

fheanor:

Is it my computer or are the pics you posted itsy-bitsy? Any chances of ones you can actually see?

moe29 · 8th February 2005, 02:53 AM

fheanor,

You must be fearless when you DIY!!

run 'em hot... FETS are cheap

MattM · 8th February 2005, 03:05 AM

Quote:

Originally posted by Bill Fitzpatrick
fheanor:

Is it my computer or are the pics you posted itsy-bitsy? Any chances of ones you can actually see?

Just click on em... Works for me!

Stocker · 8th February 2005, 04:18 AM

LOL that's cool! no pun intended... that's a clever trick.

Quote:

Originally posted by MattM
Just click on em... Works for me!

me too.

Bill Fitzpatrick · 8th February 2005, 04:34 AM

Well, isn't that amazing and how do you explain it? I tried 4 different browsers and clicked on the small pictures. NADA.

joe carrow · 8th February 2005, 04:49 AM

Just out of curiosity, is there any reason why you didn't have the heatsinks rotated 90 degrees from the way they are now? It really looks like the hot air has nowhere to go. If they were rotated, the air blown onto the sinks could exhaust into the case and out perforations in the back of the case.

-Joe

7th February 2005, 04:33 PM	#1
fheanor diyAudio Member Join Date: Oct 2003 Location: spain	compact aleph5 with cpu heatsinks finished Hello!!! Well, this is my version of the aleph 5. The case is a standard aluminium 19" rack, and the mosfets are cooled by 4 cpu heatsinks. The result is a very compact aleph 5, light, and cheap to build (this is the most important point for me ). The fan speed is adjustable, and if you want a very, very low air flow noise, the amp will run hot . The sound is very good!! Big thanks to Mr Nelson Pass and diyaudio! No exotic parts. 600 Va trafo 80000uf mkt mundorf caps Kristijan pcb's (thanks!) next step: upgrade the psu with more uf and a LcLc filter

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7th February 2005, 06:36 PM	#2
azira diyAudio Member Join Date: Dec 2003 Location: Near Seattle	Very clean implementation. What is your cover going to look like to provide for the air flow?

7th February 2005, 11:04 PM	#3
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	That's one way to get around huge heatsinks! What are you using to power the fans? Can you keep reducing fan speed until you get it as quiet as you can with enough cooling? thaks for sharing.

8th February 2005, 12:05 AM	#4
fheanor diyAudio Member Join Date: Oct 2003 Location: spain	hi again Thanks Azira, I am planing to use a drilled aluminium cover (maybe the fans won't be covered..) . Something like this Moe29, I use a small transformer to power the fans ( around 9 volts) and resistors to adjust the fan speed. I've reduce the fan speed until I'm not able to hear any air flow noise from my listening position. At this point you can touch the heatsinks during 6 or 7 seconds ... you can keep reducing the fan speed ( specially if you listen music at night at low volume ), but i don't recomend it... the mosfets will die too young . .

8th February 2005, 01:53 AM	#5
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	fheanor: Is it my computer or are the pics you posted itsy-bitsy? Any chances of ones you can actually see?

8th February 2005, 02:53 AM	#6
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	fheanor, You must be fearless when you DIY!! run 'em hot... FETS are cheap

8th February 2005, 04:34 AM	#9
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	Well, isn't that amazing and how do you explain it? I tried 4 different browsers and clicked on the small pictures. NADA.

8th February 2005, 04:49 AM	#10
joe carrow diyAudio Member Join Date: May 2004 Location: San Francisco	Just out of curiosity, is there any reason why you didn't have the heatsinks rotated 90 degrees from the way they are now? It really looks like the hot air has nowhere to go. If they were rotated, the air blown onto the sinks could exhaust into the case and out perforations in the back of the case. -Joe

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