Parallel LM3886 Chipamp layout (PA100) - 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 11th September 2008, 11:21 AM   #1
zei is offline zei  Sweden
diyAudio Member
 
Join Date: Feb 2005
Location: Gothenburg, Sweden
Default Parallel LM3886 Chipamp layout (PA100)

So i honestly stolen this design from the www and made a layout.
No point in inventing the wheel again and again.

The layout is starting to look nice but i could always use a few more eyes to spot the erros.

Schematic.
Click the image to open in full size.



And the layout.

Click the image to open in full size.


What say you all?

/JZ
__________________
Tala r tiga, silver r guld
  Reply With Quote
Old 11th September 2008, 11:28 AM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
That's not bridged.
It is parallel.

AND
look at the length of the undecoupled power rails!
Does that long power ground rail realise low inductance?
__________________
regards Andrew T.
  Reply With Quote
Old 11th September 2008, 11:44 AM   #3
zei is offline zei  Sweden
diyAudio Member
 
Join Date: Feb 2005
Location: Gothenburg, Sweden
AndrewT, Of course it is,, Thanx!

And thanx for commenting

Mmm. Well they are not that long, about 30mm between caps and screwterminals, And as you see, they can very easy be made shorter.

Noticed and i,ll fix that in the "mix"

Nothing more AndrewT?

/JZ
__________________
Tala r tiga, silver r guld
  Reply With Quote
Old 11th September 2008, 11:54 AM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally posted by zei
.....they are not that long, about 30mm between caps and screwterminals,.....
How long is it between the rightmost 100nF decoupling cap and the leftmost power pin of the left hand chipamp?
The other power pins are similarly crippled.

Do you really need parallel? Change to efficient 8ohm speakers.
What about the tolerance of the matching components to allow parallel to work correctly?
__________________
regards Andrew T.
  Reply With Quote
Old 11th September 2008, 12:05 PM   #5
zei is offline zei  Sweden
diyAudio Member
 
Join Date: Feb 2005
Location: Gothenburg, Sweden
Mmm.. you are right, it is abit long. I,ll see if i can shorten it as much as possible.

matching components should,nt be that difficult.

I get the feeling that you think the parallel chipamp is a bad id all in all? It seems to be kind of popular to build

/JZ
__________________
Tala r tiga, silver r guld
  Reply With Quote
Old 11th September 2008, 12:09 PM   #6
Account disabled at member's request
 
MJL21193's Avatar
 
Join Date: Mar 2007
The decoupling can be tacked on the bottom afterwards if needed. I see the power leads are very thin and this goes against the idea of these paralleled to handle more current.
Running between the pins on the footprint of the LM doesn't give much room. Better to move these in order to make them wider.
Attached Images
File Type: gif 1a1.gif (48.8 KB, 453 views)
  Reply With Quote
Old 11th September 2008, 12:12 PM   #7
zei is offline zei  Sweden
diyAudio Member
 
Join Date: Feb 2005
Location: Gothenburg, Sweden
Thank you MJL21193.

I,ll see what i can do

/JZ
__________________
Tala r tiga, silver r guld
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Olle:s first chipamp with LM3886! Board layout? ollebolle Chip Amps 22 31st March 2009 01:08 PM
PA100 Heat Issues...LM3886 Based..Any Ideas? MartyM Chip Amps 10 16th December 2007 11:18 PM
Non inverted, 3 x parallel LM3886 schematics and layout. markiemrboo Chip Amps 0 6th December 2007 12:42 PM
pa100 pcb single sided layout lm3886 dgaxeman Chip Amps 6 24th May 2006 01:45 AM
Are two separate lm3886 = 2*lm3886 in parallel or bridge mode rs1026 Chip Amps 11 21st October 2004 10:24 AM


New To Site? Need Help?

All times are GMT. The time now is 10:59 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