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Old 9th December 2002, 08:36 PM   #1
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Default 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
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Old 9th December 2002, 08:46 PM   #2
Philo is offline Philo  United States
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Nick,
This has been covered pretty well on other threads...
heat issues
And here:
http://www.diyaudio.com/forums/showt...ture#post21829
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Old 10th December 2002, 10:47 AM   #3
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Thanks,

I've missed those pages while browsing the forum.

Gr,
Nick
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Old 10th December 2002, 11:26 AM   #4
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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
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Old 12th December 2002, 08:39 PM   #5
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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
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Old 12th December 2002, 09:45 PM   #6
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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.
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Old 13th December 2002, 05:19 PM   #7
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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
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Old 13th December 2002, 08:55 PM   #8
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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
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