Help on LM3886 PCB Routing - Page 8 - 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 24th September 2012, 06:58 PM   #71
diyAudio Member
 
Join Date: Apr 2007
Andrew i dont fully understand u my english its not too good.

Tom, ill try to find some smallest capacitor but it ill be hard find good small capacitors, here we got a lot of bad chineese products.

Here is the last pcb whit the Cmute moved were it was at first for anyone who want build this amp, its not tested yet, so check first everything before build it.

Ty Guys for helping me on this pcb.
Attached Files
File Type: zip LM3886.zip (65.7 KB, 50 views)
  Reply With Quote
Old 25th September 2012, 03:51 AM   #72
gootee is offline gootee  United States
diyAudio Member
 
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
Quote:
Originally Posted by necrofago View Post
Andrew i dont fully understand u my english its not too good.

Tom, ill try to find some smallest capacitor but it ill be hard find good small capacitors, here we got a lot of bad chineese products.

Here is the last pcb whit the Cmute moved were it was at first for anyone who want build this amp, its not tested yet, so check first everything before build it.

Ty Guys for helping me on this pcb.
What do you look for, to find "good" ones? Can you measure ESR of DF? Or do you just go by reputation?

I still say use a 2-sided PCB. The part with the caps won't require extremely-good alignment (which is easy anyway) and the rest can be etched off if you want but I'd use it and re-do the layout. OR, you could just make a separate board or two for the cap arrays, 2-sided. You don't even have to etch the cap array board, except around the holes for one lead of each cap to go through to the other side. So no alignment necessary at all. Other lead of each cap just gets bent and soldered to the surface. A bag of 100uF or 220 uF or 330 uF is probably cheaper than a few big caps, and would work MUCH better. And having so many of them "averages out" any bad ones. And even if all of them were poor quality an array of a lot of them would almost-certainly still be better than a few large good-quality caps. They would also have a lower height, which might help in mounting etc. You could probably even stack two of them and get larger arrays into the same space, over the same part of the main board. Lots of possibilities.

But I guess I would finish what you have, now, first, and then do arrays later, either as a replacement, or an add-on, for the caps on the PCB you have now.

Enjoy.
  Reply With Quote
Old 25th September 2012, 09:43 AM   #73
diyAudio Member
 
Join Date: Apr 2007
Saddly i dont got much experience to do a 2-sided pcb thats why i got for a 1 side at first time, and i dont know were to start...
  Reply With Quote
Old 25th September 2012, 10:50 AM   #74
tsiros is offline tsiros  Greece
diyAudio Member
 
tsiros's Avatar
 
Join Date: Jun 2012
Location: Patra, Greece
Send a message via MSN to tsiros Send a message via Skype™ to tsiros
Today my lm3886 have arrived (and the lm1876 too... which is less powerful and i plan on making a small and pretty 10W@8Ω amp for the miss)

I would expect that so far there would've been a good tried and tested lm3886 pcb, no?

the p2p version that you guys linked to looks good but i am afraid demands delicacy that my butterfingers don't have
  Reply With Quote
Old 25th September 2012, 07:01 PM   #75
diyAudio Member
 
Join Date: Apr 2007
tsiros, ill build my modification of the pcb in a few days, maybe can u try it too.
  Reply With Quote
Old 26th September 2012, 04:00 AM   #76
gootee is offline gootee  United States
diyAudio Member
 
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
Quote:
Originally Posted by tsiros View Post
Today my lm3886 have arrived (and the lm1876 too... which is less powerful and i plan on making a small and pretty 10W@8Ω amp for the miss)

I would expect that so far there would've been a good tried and tested lm3886 pcb, no?

the p2p version that you guys linked to looks good but i am afraid demands delicacy that my butterfingers don't have
This one is VERY good, as is. The rest of what I have suggested is just like extra icing on a cake. A research project. Go with what necrofago has posted so far. It will be great.
  Reply With Quote
Old 26th September 2012, 07:04 PM   #77
diyAudio Member
 
Join Date: Oct 2007
Quote:
Originally Posted by necrofago View Post
Andrew i dont fully understand u my english its not too good.

Tom, ill try to find some smallest capacitor but it ill be hard find good small capacitors, here we got a lot of bad chineese products.

Here is the last pcb whit the Cmute moved were it was at first for anyone who want build this amp, its not tested yet, so check first everything before build it.

Ty Guys for helping me on this pcb.
Necrofago, thanks for taking this layout to the next level.
See the pics below to illustrate what Andrew means - you can
allow using different sized capacitors which will make the layout more
flexible.

Click the image to open in full size.

Click the image to open in full size.
  Reply With Quote
Old 26th September 2012, 07:12 PM   #78
diyAudio Member
 
Join Date: Apr 2007
Cool quadtech ty for the pics, now i get it.
  Reply With Quote
Old 27th September 2012, 08:30 PM   #79
diyAudio Member
 
Join Date: Apr 2007
Guys, i just build the board in mono stage, and it worked good. Clear sound, no distortions (at least for my ear), sadly i cant test it more in deep today, ill try tomorrow whit the stereo setup.

Just 1 bad thing and its the size of some components, what i have are a little more big than the pcb, but not big deal.

If anyone wanna build this pcb it works rly good.

Cheers.
  Reply With Quote
Old 28th September 2012, 09:27 AM   #80
diyAudio Member
 
Join Date: Oct 2007
Quote:
Originally Posted by necrofago View Post
Guys, i just build the board in mono stage, and it worked good. Clear sound, no distortions (at least for my ear), sadly i cant test it more in deep today, ill try tomorrow whit the stereo setup.

Just 1 bad thing and its the size of some components, what i have are a little more big than the pcb, but not big deal.

If anyone wanna build this pcb it works rly good.

Cheers.
Great!
Looking forward to the pictures. BTW, there is scope to clean up the power and signal ground traces a bit, but
it dosen't matter too much as those ground areas are filled in correctly when you click on Ratsnest.

Gootee et al - thanks for all the help and handholding you give to folks here, and make this a great forum.

Last edited by quadtech; 28th September 2012 at 09:34 AM.
  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
PCB routing for audioamps SM2GXN Solid State 38 4th May 2012 04:28 AM
PCB placing and routing akis Parts 9 7th January 2012 08:48 AM
Any tips for routing heaters on a PCB KX36 Tubes / Valves 10 14th August 2011 02:26 AM
PCB Routing Mark245 Parts 15 27th May 2009 07:54 PM


New To Site? Need Help?

All times are GMT. The time now is 03:40 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