Chip Amp Photo Gallery - Page 223 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 23rd October 2012, 11:55 PM   #2221
diyAudio Member
 
Join Date: Oct 2005
Lm1875 amp with 6ak5 buffer. Horrible wiring etc. but no issues with hum or noise. Sounds much more alive than non-buffered amp. Tempted to build another valve buffered chip amp with neater wiring. Transformer cover to be added for safety :-)
Attached Images
File Type: jpg image.jpg (696.6 KB, 1211 views)
  Reply With Quote
Old 23rd October 2012, 11:57 PM   #2222
diyAudio Member
 
Join Date: Oct 2005
Does a nice job with efficient speakers. Probably 10W max output given low voltage rails.
Attached Images
File Type: jpg image.jpg (663.6 KB, 1121 views)
  Reply With Quote
Old 24th October 2012, 08:14 AM   #2223
diyAudio Member
 
mhouston's Avatar
 
Join Date: Jan 2006
Location: Victoria, Australia
Quote:
Originally Posted by sharpi31 View Post
Lm1875 amp with 6ak5 buffer. Horrible wiring etc. but no issues with hum or noise. Sounds much more alive than non-buffered amp. Tempted to build another valve buffered chip amp with neater wiring. Transformer cover to be added for safety :-)
Lodda loose wire.
  Reply With Quote
Old 24th October 2012, 08:28 AM   #2224
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by mhouston View Post
Lodda loose wire.
or expletive !
__________________
regards Andrew T.
  Reply With Quote
Old 1st November 2012, 10:10 PM   #2225
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
Default What the H### is a BLAT ?

Here is a link to a fun project combining PC liquid cooling techniques and a small footprint power amp build. A bit of overkill for the LM3886 family but could easily be applied to high-temp situations.
Attached Images
File Type: jpg 20121101_152037.jpg (132.4 KB, 913 views)
File Type: jpg B28.jpg (103.7 KB, 862 views)
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote
Old 2nd November 2012, 02:15 PM   #2226
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
Liquid cooled build thread is up for those who may be interested.
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote
Old 2nd November 2012, 02:20 PM   #2227
diyAudio Member
 
linuxworks's Avatar
 
Join Date: Jul 2008
Location: santa clara, CA
chip-amps get hot enough to warrant liquid cooling? really??
__________________
My Photostream:http://www.flickr.com/photos/linux-works/
  Reply With Quote
Old 2nd November 2012, 03:05 PM   #2228
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
Quote:
Originally Posted by linuxworks View Post
chip-amps get hot enough to warrant liquid cooling? really??
No - Not actually, the idea crossed my mind several months ago when I was testing several standard convection heat sinks. Thought it would be good to introduce a control element. When the LM3886 gets close to the temperature protection trigger point the sound can deteriorate and intermittent drop outs occur.

In general the available SPL from the MyRef family is in the usable range with only an attenuation pot. As a big band fan/player, I push the amps (using 200 & 300 VA toriods in some builds) with a JC-2 pre and they stay in the upper range of the power scale when driving my fairly inefficient speakers. No doubt a larger heat sink could be sufficient, but that wouldn't be any fun.

I have said in several posts that this may well be overkill for a chipamp, but there is a possibility it might be a prety good fit for something like hotter transistor builds. I've seen some F5s and such the size of a small freezer There is also the possibility of hearing/measuring the performance of the LM3886 across it's working temp range. Not a super high priority but potentially interesting. I'll post anything of significance if I stumble across it.
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."

Last edited by bcmbob; 2nd November 2012 at 03:12 PM.
  Reply With Quote
Old 2nd November 2012, 03:48 PM   #2229
diyAudio Member
 
linuxworks's Avatar
 
Join Date: Jul 2008
Location: santa clara, CA
don't you hear the pump, in a quiet room?

I can't have/tolerate any fans on, or inside my audio gear. my hafler dh500 sits unused since the damned thing needs a fan.

that's why I was surprised to see a noise-creator (lol, sorry) in your system, put there on purpose.
__________________
My Photostream:http://www.flickr.com/photos/linux-works/
  Reply With Quote
Old 2nd November 2012, 04:16 PM   #2230
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
Don't know if you have any experience with the liquid cooling for PC world, but they have developed some fantastically quiet pumps and fans. Once all the air has worked completely out of the system the pumps are dead silent. You have to touch them to make sure they are working. Fans are almost as good and any trace of noise beyond ~ 12" can be eliminated by slowing them down a bit.

The major cooling is not from fan air flow. All that is needed is a steady light breeze across the fins of the radiator. A little adjustment for efficient air and liquid flow rate (less is better) does the trick. There are also some good additives that both protect any metal components and increase heat transfer.

I guarantee you can build a liquid system all the way up to the 120mm format that you can't hear past 1 foot.
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 09:21 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2