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

Chip Amps Amplifiers based on integrated circuits

LM1875 - oh so slowly
LM1875 - oh so slowly
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
Thread Tools Search this Thread
Old 4th November 2011, 02:59 AM   #21
Leolo is offline Leolo  Canada
diyAudio Member
Leolo's Avatar
Join Date: Dec 2009
Location: Quebec
Regardless of the distinction between heatsink and heat spreader, the point is that my ALU plates are most likely inadequate for my needs.

I've fixed my amp but haven't run any more tests as I've been rebuilding my work bench. And to build a work bench, first one must tidy up ones entire basement.

Anyway, I have a plan. Well 3 plans. The ideal plan would be do conclude that 2 alu plates are enough.

Plan number 2 would involve scraping the plates and using a largish, well fined heat sink I pulled out of the trash last week end.

Plan number 3 would be to use some 5/16 (OD) copper pipe that I have a lot of. Crush some of it and grind it flat, bolt it to the ALU plates, bend it into artistic shapes and have it protrude along slots in the top/side of the case. Attached are some squetches that might confuse you more, or it might make my idea clearer.

Anyway, the advantages of this plan are that it brings the heat outside the case. And given that the slots won't be precise, will allow air to circulate. What's more, it will look cool; I'm going for a steam-punk look for the case and one common complaint about steamy stuff is that all the protrutions are just useless. But these protrutions will actually be part of the mechanism.

The disadvantage is that getting to the amp PCBs and attenuator will be that much more annoying. And it might not be possible to have adequate thermal contact between the ALU and the copper pipes.
Attached Images
File Type: jpg tube-sink.jpg (66.3 KB, 129 views)
  Reply With Quote
Old 4th November 2011, 05:08 AM   #22
riverwarrior is offline riverwarrior  United States
diyAudio Member
Join Date: Nov 2011
Location: Santa Barbara, CA

That drawing is awesome. I think you have a great idea for an original case. Might I suggest that you mount the 1875 directly to the flattened portion of the coppoer pipe? Copper is an excellent heat conductor, and leaving the top and bottom of the pipe open for air to pass through would provide cooling.

  Reply With Quote
Old 5th November 2011, 07:51 PM   #23
Leolo is offline Leolo  Canada
diyAudio Member
Leolo's Avatar
Join Date: Dec 2009
Location: Quebec
Air circulating in the pipe is a nice idea. However, this piping 5/16" OD, 1/32" wall thickness. So kinda flimsy to mount the chips directly too. And the pipe has to be crushed to a- maximise surface area with th Al and b- get a bolt through it.

Hmmm... maybe some sort of manifold config, like Zalman et al use for fan-less CPU heat sinks.

Or, have the bolts that attach the Cu to the Al low on the Al, a few holes above (but still inside the case) and a some holes outside of the case to promote air exchange.

OK, this is getting complicated.
  Reply With Quote


LM1875 - oh so slowlyHide 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
head unit slowly dying... not my wiring! audioaddiction Car Audio 6 3rd October 2011 11:30 AM
Slowly collecting stuff to test kp Multi-Way 3 11th July 2009 04:45 PM
Klipsch woofer oscillating slowly on some recordings? Brit01 Multi-Way 15 26th May 2009 03:48 PM
Slowly does it !! Andy G Multi-Way 6 7th September 2006 09:14 AM

New To Site? Need Help?

All times are GMT. The time now is 04:48 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio