Grounds concept/direction/advice - 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 5th March 2008, 08:19 AM   #1
diyAudio Member
 
Join Date: Dec 2005
Location: Silly'pore
Default Grounds concept/direction/advice

I have built a number of perfboard circuits, mostly chip amps. I usually built each module as a monoblock, ala chip amp kits; each with its own star ground. They work perfect individually, however in stereo or bridged mode, the sound one channel dominates the other channel.

I believe the problem is the location of common ground because i don't have issues with circuits i build as stereo.

So, in an aid to designing better perfboard grounds, (where ground planes are not possible) Should I:

1) Create 2 star grounds, one for signal and one for power

2) Pull out the common grounds from each channel into a common ground at psu ground

3) Connect both grounds at every possible opportune, ie signal, power and speaker ends.

Any advice/debate would be lovely

Chuck
  Reply With Quote
Old 5th March 2008, 08:23 AM   #2
Puffin is offline Puffin  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: U.K
Are you referring to a Bridged or parallel circuit ? Which chips are you using ?
  Reply With Quote
Old 5th March 2008, 10:56 AM   #3
diyAudio Member
 
gainphile's Avatar
 
Join Date: Dec 2007
Location: Melbourne the sunny city!
This is my approach to grounding. Your miles may vary:


Gainclone HUM, THUMP problems - The solution
__________________
http://gainphile.blogspot.com
  Reply With Quote
Old 5th March 2008, 02:06 PM   #4
diyAudio Member
 
Join Date: Dec 2005
Location: Silly'pore
Quote:
Originally posted by Puffin
Are you referring to a Bridged or parallel circuit ? Which chips are you using ?

Bridged.

My Parallels oscillated too much, i was too lazy to match the chips thinking it was suffice that they were from the same batch.

Chips.. LT1210 (w/servo), LM1785(inverting), LM3785(non-inverting)
  Reply With Quote
Old 5th March 2008, 02:32 PM   #5
Puffin is offline Puffin  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: U.K
I have bridged LM3886's and made two monoblocks ( i.e 2 chips per block) Each amp sounds indentical. You say you have got different gain on each amp ?
  Reply With Quote
Old 5th March 2008, 04:32 PM   #6
diyAudio Member
 
Join Date: Dec 2005
Location: Silly'pore
I was saying i had bad grounds connections and the uneven balance was a sign.
  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
Isolating L and R grounds??? wrestlinguy Parts 5 13th June 2006 03:50 PM
Multiple Grounds Wynand Chip Amps 12 4th December 2005 11:38 AM
Should grounds go like this? leander Solid State 18 17th November 2005 11:55 PM
PSU sharing grounds neutron7 Parts 2 5th March 2005 12:23 AM
Transformers and grounds soundNERD Chip Amps 21 18th February 2004 01:10 PM


New To Site? Need Help?

All times are GMT. The time now is 08:12 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