Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

Amp Camp Amp - ACA
Amp Camp Amp - ACA
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
Reply
 
Thread Tools Search this Thread
Old 12th June 2018, 09:57 PM   #4591
RafaPolit is offline RafaPolit  Ecuador
diyAudio Member
 
RafaPolit's Avatar
 
Join Date: Dec 2016
Location: Quito, Ecuador
Well, with the current setup contenders (either vertical or horizontal PCBs) with cables to the MOSFETs as short as possible, I can put Q1 above on both channels and just cross the wires differently from one channel to the other, so this shouldn't be an issue now (I hope)
  Reply With Quote
Old 12th June 2018, 11:06 PM   #4592
RafaPolit is offline RafaPolit  Ecuador
diyAudio Member
 
RafaPolit's Avatar
 
Join Date: Dec 2016
Location: Quito, Ecuador
This seems like the simplest solution. It does requires to drill the heatsink (not really fan of that!):
SolderedInner.jpg

The question is: is the Heatsinks' ability to dissipate heat lost to this setup? Ideally the MOSFETs should be in the center and next to the really think 'core' nerve of the heatsink, just as the original design. Do you think this takes much away from its ability to do its job?

Thanks again, sorry for the insecurities! Best regards,
Rafa.
  Reply With Quote
Old 13th June 2018, 12:40 AM   #4593
astromo is offline astromo  Australia
diyAudio Member
 
Join Date: Nov 2017
Location: BFN
Quote:
Originally Posted by RafaPolit View Post
This seems like the simplest solution. It does requires to drill the heatsink (not really fan of that!):
Attachment 686497

The question is: is the Heatsinks' ability to dissipate heat lost to this setup? Ideally the MOSFETs should be in the center and next to the really think 'core' nerve of the heatsink, just as the original design. Do you think this takes much away from its ability to do its job?

Thanks again, sorry for the insecurities! Best regards,
Rafa.
If you want to maximise useful air flow up the internal heat sinks, would you be able tho perforated the case's top plate? As in right above the the heat sink fins. Hot air rising and all, that might offer a better deal than the side perforations you've already got.

Maybe suck it and see?
  Reply With Quote
Old 13th June 2018, 01:28 AM   #4594
rnjorge is offline rnjorge  Brazil
diyAudio Member
 
Join Date: May 2016
Location: Campinas SP
On post #4582, why not place the mosfets from above the board, instead of from below? It would put the boards farther away from the heatsinks.
That was my 3rd cent. The fourth would be to use 19v power supply, because they get really hot with 24v in tropical weather.
  Reply With Quote
Old 13th June 2018, 10:20 AM   #4595
muskyhuntr is offline muskyhuntr  United States
diyAudio Member
 
Join Date: Aug 2012
Location: Northern Kentucky
You might try a thickish aluminum bar to bring the mounting surface out.

Bar would probably help with cooling also.


Me
__________________
Used, abused, and confused husband of....
  Reply With Quote
Old 13th June 2018, 11:27 AM   #4596
Alan4411 is offline Alan4411  Wales
diyAudio Member
 
Alan4411's Avatar
 
Join Date: Oct 2011
Location: West Wales
If you are thinking about mounting the FETs as in #4592 my initial reaction is don't. You achieve far better thermal distribution using the central part of the heat sink.
You could use some thick aluminium 'angle' and use the existing heat sink holes to mount it. Then you can fit the FETs and board to the other angle. Choose the best fit for the boards from there?

Sorry no design software here just old fashioned paper and pencil...

Maybe simpler to engineer than the aluminium slab muskyhunter suggests, though that would indeed give you more thermal mass to play with and let you mount the boards parallel to the sinks easier.
Attached Images
File Type: jpg Heatsink-001.jpg (495.7 KB, 326 views)
  Reply With Quote
Old 13th June 2018, 11:37 AM   #4597
coolnose is offline coolnose  Europe
diyAudio Member
 
coolnose's Avatar
 
Join Date: Sep 2009
I second the last proposition, that's how i did on a 15w pp amp with similar dissipation.

I overdid it and can't put the lid on in summer, but yiu get the idea.
Attached Images
File Type: jpg 010220121916.jpg (81.0 KB, 306 views)

Last edited by coolnose; 13th June 2018 at 11:41 AM. Reason: Pic
  Reply With Quote
Old 13th June 2018, 11:51 AM   #4598
Dennis Hui is offline Dennis Hui  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
Amp Camp Amp - ACA
Very nice drawing Alan!

The aluminum L-bracket is a nice solution and should be easy to find world wide.
I think 5mm+ thinkness should do.
__________________
We are fearless amplifier builders. A little heat doesn't scare us at all.
- NP 2002
  Reply With Quote
Old 13th June 2018, 03:06 PM   #4599
chrisb is offline chrisb
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Are you confident you’ll get enough heat transfer to the mass of the finned assembly by mounting the output devices on the thin end fin?
I’m sure there’s a reason the centre of the thickest section of the heat sunk is normally used
__________________
like my mind, this space intentionally blank
  Reply With Quote
Old 13th June 2018, 03:49 PM   #4600
coolnose is offline coolnose  Europe
diyAudio Member
 
coolnose's Avatar
 
Join Date: Sep 2009
Quote:
Originally Posted by Dennis Hui View Post
Very nice drawing Alan!

The aluminum L-bracket is a nice solution and should be easy to find world wide.
I think 5mm+ thinkness should do.
I used 50x50x5mm as can be estimated in the picture, 2 amplifier modules (roughly 40W dissipation each) per Heatsink is too much in my case... 1/ amp would be perfect.

Although I think ACA will run hot on the small heatsinks, as said by someone else before, worst case just run it at 19V "only" to limit dissipation.

Last edited by coolnose; 13th June 2018 at 03:54 PM. Reason: amplifier instead of amps to avoid confusion with A
  Reply With Quote

Reply


Amp Camp Amp - ACAHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Amp Camp Amp #1 Nelson Pass diyAudio.com Articles 54 8th May 2018 03:13 AM
Amp Camp! Jason Site Announcements 2 30th June 2012 02:57 PM
Best D camp config for Tweeter amp Zero One Class D 0 24th February 2010 04:57 AM
better the Pass camp? rick57 Tubes / Valves 6 26th March 2005 06:04 AM


New To Site? Need Help?

All times are GMT. The time now is 12:03 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki