My tiny single sided LM3886 PCB layout. :) - Page 2 - 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 13th July 2005, 03:18 PM   #11
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
Yes, I know, but would they still not interact?
__________________
Less pulp more juice Twisted Pear Audio.
  Reply With Quote
Old 13th July 2005, 03:28 PM   #12
Mr Evil is offline Mr Evil  United Kingdom
diyAudio Member
 
Join Date: Aug 2004
Location: Behind you
The point of a Zobel network on the amp's output is to provide a low impedance termination for high frequencies, which increases stability. A Zobel in a speaker can't do that because it's seen through the resistance+inductance of the speaker cable.

Of course you might not need a Zobel, but it can't hurt to leave room for one, just in case.
__________________
https://mrevil.asvachin.eu/
  Reply With Quote
Old 13th July 2005, 04:45 PM   #13
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
Quote:
Originally posted by Mr Evil
The point of a Zobel network on the amp's output is to provide a low impedance termination for high frequencies, which increases stability. A Zobel in a speaker can't do that because it's seen through the resistance+inductance of the speaker cable.

Of course you might not need a Zobel, but it can't hurt to leave room for one, just in case.

Yeah, I understand they have different roles, but I thought I read somewhere that they could interact. Still, I suppose putting places for the components is a good idea, and it can't hurt as you can omit them. I will do so in the next revision.
__________________
Less pulp more juice Twisted Pear Audio.
  Reply With Quote
Old 13th July 2005, 05:57 PM   #14
mateo88 is offline mateo88  United States
diyAudio Member
 
Join Date: May 2004
Location: Argyle, Texas
Does pin 5 need to be connected to V+, or can you just choose between 1 and 5?
  Reply With Quote
Old 13th July 2005, 06:02 PM   #15
BrianGT is offline BrianGT  United States
diyAudio Moderator Emeritus
 
BrianGT's Avatar
 
Join Date: Jan 2002
Location: near Atlanta, GA
Send a message via AIM to BrianGT
Default Re: Update

Quote:
Originally posted by Russ White
OK, I tweaked the layout a little and etched the boards. I will build the amp tonight. Here is the latest layout:

Click the image to open in full size.
The board looks good. It certainly is more tricky working with 1 layer.

Do you not need to tie pin 5 to V+? I haven't tried it without it, but I guess you could put a short circuit jumper on the chip package to tie these pins together to V+.

Best of luck with the amp,

--
Brian
  Reply With Quote
Old 13th July 2005, 06:15 PM   #16
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
Hmmmmmm.... In the library I have pin 5 is not connected to V+! I will have to fix that.

Here we go.


Click the image to open in full size.
__________________
Less pulp more juice Twisted Pear Audio.
  Reply With Quote
Old 13th July 2005, 06:40 PM   #17
BrianGT is offline BrianGT  United States
diyAudio Moderator Emeritus
 
BrianGT's Avatar
 
Join Date: Jan 2002
Location: near Atlanta, GA
Send a message via AIM to BrianGT
Looks better. Another suggestion is to make the NC pads on the chip smaller, so that you can maximize the power traces.

--
Brian
  Reply With Quote
Old 13th July 2005, 07:01 PM   #18
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
How is this?
Click the image to open in full size.
__________________
Less pulp more juice Twisted Pear Audio.
  Reply With Quote
Old 13th July 2005, 07:24 PM   #19
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
Now with zobel. I think is it.

Click the image to open in full size.
__________________
Less pulp more juice Twisted Pear Audio.
  Reply With Quote
Old 13th July 2005, 07:31 PM   #20
Banned
 
Join Date: Jan 2005
Good job
  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
lm3875 single sided pcb layout SolderN Chip Amps 18 12th August 2009 10:11 PM
pa100 pcb single sided layout lm3886 dgaxeman Chip Amps 6 24th May 2006 01:45 AM
Wanted single sided PCB layout sivan_and Chip Amps 6 26th January 2006 10:36 PM


New To Site? Need Help?

All times are GMT. The time now is 02:26 PM.


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