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Amp Camp Amp - ACA
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Old 10th November 2017, 06:37 PM   #3511
kwolff67 is offline kwolff67  United States
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Knowing nothing about heatsinks, I wondered if I could trouble someone to let me know if this spec is ok for the ACA. Length I ordered is 10" (Qty2). This width was like $.30 per inch cheaper than some others close to this size, and now I'm afraid I might have gotten it wrong.
I still don't understand the c/w rating.

Extruded Aluminum Heatsink
Alloy: 6063-T5
Width: 4.850"
Fin Height: .66"
Base: .140"
C/W/3": approximately 2.25
Weight per Inch: .13

Last edited by kwolff67; 10th November 2017 at 06:56 PM.
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Old 10th November 2017, 07:01 PM   #3512
wrath is offline wrath  Poland
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Quote:
Originally Posted by kwolff67 View Post
I still don't understand the c/w
Base: .140"
C/W/3": approximately 2.25
Weight per Inch: .13
If you push 1 watt into that radiator temperature will rise 2.25 celsius
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Old 10th November 2017, 07:14 PM   #3513
kwolff67 is offline kwolff67  United States
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Quote:
Originally Posted by wrath View Post
If you push 1 watt into that radiator temperature will rise 2.25 celsius
Thank you.
So pushing a maximum of 7 watts the temperature would be close to 16c or 60F. That sounds like it should be fine and never go hotter than room temperature unless I'm missing something. Or do I need to factor in ambient temperature as well?
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Old 10th November 2017, 08:26 PM   #3514
Gregje is offline Gregje  United Kingdom
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Quote:
Originally Posted by kwolff67 View Post
Thank you.
So pushing a maximum of 7 watts the temperature would be close to 16c or 60F. That sounds like it should be fine and never go hotter than room temperature unless I'm missing something. Or do I need to factor in ambient temperature as well?
It will be 16c warmer than your room
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Old 10th November 2017, 09:07 PM   #3515
kwolff67 is offline kwolff67  United States
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Quote:
Originally Posted by Gregje View Post
It will be 16c warmer than your room
Ok, that's too hot. I need the amp to be on most of the day, and have 2 dogs and a cat, all with a curious nature.

I canceled the order and will get something larger with at least 1inch fins.
Thanks.
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Old 11th November 2017, 09:50 AM   #3516
wrath is offline wrath  Poland
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6 watt aca push into speaker. Into heatsink more like 12....
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Old 11th November 2017, 06:59 PM   #3517
pinholer is offline pinholer  Canada
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The thermal coefficient of 2.25 C/W is for a 3" long piece so a 10" piece will have better performance.
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Old 12th November 2017, 01:32 AM   #3518
kwolff67 is offline kwolff67  United States
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I think this will work better. It has 1 inch fins and a much thicker base and a c/w of 1.15. Same 10inch length or maybe 12.

Alloy: 6063-T5
Width: 5.375"
Fin Height: 1"
Base: .375"
C/W/3": approximately 1.15
Weight per Inch: .37
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Old 12th November 2017, 08:31 PM   #3519
kwolff67 is offline kwolff67  United States
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PCBs and Keratherm pads ordered from DIYAudio store.
LSK170 ordered from NAC.
The rest from Digikey.

Just one thing I'd like to confirm:

LSK170A TO92 - This is the correct JFet for Q4, right?
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Old 12th November 2017, 08:43 PM   #3520
Zen Mod is offline Zen Mod  Serbia
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Amp Camp Amp - ACA
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though , there is already asked and replied same question and solution
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