Heatsinks - Aleph 5

ElectroNick · 9th December 2002, 08:36 PM

Hello,

Because i'm new, here i haven't read all the pages so excuse my (maybe allready answered) question.
I've got all the parts and want to start building, but... will two heatsinks (fischer SK47) do the job ?
According to the chart they are rated @ 0.55 C/W.

Please don't tell me to buy bigger heatsinks

Tell me it will enough.....?

Gr
Nick

Philo · 9th December 2002, 08:46 PM

Nick,
This has been covered pretty well on other threads...
heat issues
And here:
http://www.diyaudio.com/forums/showt...ture#post21829

ElectroNick · 10th December 2002, 10:47 AM

Thanks,

I've missed those pages while browsing the forum.

Gr,
Nick

kristijan-k · 10th December 2002, 11:26 AM

Hello Nick,

The your heatsinks (2 x 0.55 C/W per one Aleph 5 channel)
will run around 42 C above ambient temperature.
This is little high, but it should work.
Also, the lifespan of the output devices will be little shorter.

The 3 x 0.55 C/W per one Aleph 5 Channel would be better,
and at the end, not that much expensive.

Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip

ElectroNick · 12th December 2002, 08:39 PM

Does anyone know if it would be a crime to use a 2 x 25Vac transformer instead of a 2 x 28Vac for the Alpeh 5 ?
Maybe the lower voltage can compensate the shortage in heatsink ?

Gr,
Nick

blank527 · 12th December 2002, 09:45 PM

That's no problem at all.
But it will degrade your rated output wattage. I.E. 30Watts wil be 25 watts or so.
I'm doing the same for mine amplifier.(stereo 60Watts)
Mine..
Since my front and back will also have heatsinks there will be (hopefully) enough heat dissipation.

ElectroNick · 13th December 2002, 05:19 PM

Well Blank527,

You don't seem to have a problem with cooling your amp....
Those heatsinks, are they Fischer types

If yes, do you have a supplier adres for The Netherlands...
The few amounts of watts that i'll lose don't matter (i hope)

I hope those power failures in Amsterdam aren't caused by you tunrning on the amp (since you don't inrusch limiters)

Anyway, great work !!!

Gr,
Nick

blank527 · 13th December 2002, 08:55 PM

Hi,

No the heatsinks aren't fischer types.
They are surplus and got them from scrap from a transmitter.
I know they seem a little odd, but what the heck..it's cheap. 20 euro per sink(army goods).
And yes, I'm a little scared for the inrush current, but since then..
it's not finished yet!
I bought some coils to reduce (a little) the inrush.
More to come.
Can't wait to finish!
Still waiting for my fets.
Hope santa claus comes around real soon.

Greetings.
Remco

9th December 2002, 08:36 PM	#1
ElectroNick diyAudio Member Join Date: Dec 2002 Location: The Netherlands	Heatsinks - Aleph 5 Hello, Because i'm new, here i haven't read all the pages so excuse my (maybe allready answered) question. I've got all the parts and want to start building, but... will two heatsinks (fischer SK47) do the job ? According to the chart they are rated @ 0.55 C/W. Please don't tell me to buy bigger heatsinks Tell me it will enough.....? Gr Nick

9th December 2002, 08:46 PM	#2
Philo diyAudio Member Join Date: Jul 2002 Location: Ever sunny San Diego	Nick, This has been covered pretty well on other threads... heat issues And here: http://www.diyaudio.com/forums/showt...ture#post21829 __________________ Philip "If you didn't make it with your own two hands, its not really yours".

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
FS: Heatsinks for Aleph(s)..	skaara	Swap Meet	2	29th August 2006 10:36 AM
are my aleph 2 heatsinks big enough ?	dhole	Pass Labs	12	8th December 2004 09:25 PM
Heatsinks for Aleph 5	tobias_svensk	Pass Labs	2	15th February 2004 04:08 AM
Heatsinks for Aleph	skaara	Pass Labs	8	16th September 2002 07:30 AM
heatsinks for aleph 2.	BrianGT	Pass Labs	12	12th March 2002 06:59 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

10th December 2002, 10:47 AM	#3
ElectroNick diyAudio Member Join Date: Dec 2002 Location: The Netherlands	Thanks, I've missed those pages while browsing the forum. Gr, Nick

10th December 2002, 11:26 AM	#4
kristijan-k diyAudio Member Join Date: Mar 2002 Location: CROATIA	Hello Nick, The your heatsinks (2 x 0.55 C/W per one Aleph 5 channel) will run around 42 C above ambient temperature. This is little high, but it should work. Also, the lifespan of the output devices will be little shorter. The 3 x 0.55 C/W per one Aleph 5 Channel would be better, and at the end, not that much expensive. Best regards, Kristijan Kljucaric http://web.vip.hr/pcb-design.vip

12th December 2002, 08:39 PM	#5
ElectroNick diyAudio Member Join Date: Dec 2002 Location: The Netherlands	Does anyone know if it would be a crime to use a 2 x 25Vac transformer instead of a 2 x 28Vac for the Alpeh 5 ? Maybe the lower voltage can compensate the shortage in heatsink ? Gr, Nick

12th December 2002, 09:45 PM	#6
blank527 diyAudio Member Join Date: Nov 2001 Location: Haarlem	That's no problem at all. But it will degrade your rated output wattage. I.E. 30Watts wil be 25 watts or so. I'm doing the same for mine amplifier.(stereo 60Watts) Mine.. Since my front and back will also have heatsinks there will be (hopefully) enough heat dissipation.

13th December 2002, 05:19 PM	#7
ElectroNick diyAudio Member Join Date: Dec 2002 Location: The Netherlands	Well Blank527, You don't seem to have a problem with cooling your amp.... Those heatsinks, are they Fischer types If yes, do you have a supplier adres for The Netherlands... The few amounts of watts that i'll lose don't matter (i hope) I hope those power failures in Amsterdam aren't caused by you tunrning on the amp (since you don't inrusch limiters) Anyway, great work !!! Gr, Nick

13th December 2002, 08:55 PM	#8
blank527 diyAudio Member Join Date: Nov 2001 Location: Haarlem	Hi, No the heatsinks aren't fischer types. They are surplus and got them from scrap from a transmitter. I know they seem a little odd, but what the heck..it's cheap. 20 euro per sink(army goods). And yes, I'm a little scared for the inrush current, but since then.. it's not finished yet! I bought some coils to reduce (a little) the inrush. More to come. Can't wait to finish! Still waiting for my fets. Hope santa claus comes around real soon. Greetings. Remco

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)