Gainclone HUM, THUMP problems - The solution - Page 3 - 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 March 2008, 11:04 AM   #21
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Does anyone have a view on whether the two decoupling caps (in post1) should be connected together first and then taken to the Audio Ground?
__________________
regards Andrew T.
  Reply With Quote
Old 23rd March 2008, 12:48 PM   #22
Puffin is offline Puffin  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: U.K
AndrewT. I hadn't thought about taking the grounds from the caps separately, as I always thought the considered way was to put a stout piece of wire as the "power" ground.

http://i73.photobucket.com/albums/i239/saxonsex/GC1.jpg
  Reply With Quote
Old 23rd March 2008, 04:53 PM   #23
gootee is offline gootee  United States
diyAudio Member
 
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
Quote:
Originally posted by AndrewT
Does anyone have a view on whether the two decoupling caps (in post1) should be connected together first and then taken to the Audio Ground?
My view is that they SHOULD be connected together, near the chipamp, and should also connect to ground very close to each other, there. Otherwise (or even additionally), another small cap should connect directly between the V+ and V- power pins.
__________________
The electrolytic capacitors ARE the signal path: http://www.fullnet.com/~tomg/zoom3a_33kuF.jpg
  Reply With Quote
Old 23rd March 2008, 05:03 PM   #24
gootee is offline gootee  United States
diyAudio Member
 
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
Quote:
Originally posted by gainphile
I got the diagram with no 5W resistor. How do I update the diagram?
See Figure 3, at http://sound.westhost.com/earthing.htm .
__________________
The electrolytic capacitors ARE the signal path: http://www.fullnet.com/~tomg/zoom3a_33kuF.jpg
  Reply With Quote
Old 23rd March 2008, 05:12 PM   #25
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi Gootee,
I have already sent him a private message with instructions on where to find the less dangerous disconnecting network and how to contact the moderators to remove the dangerous diagram and substitute the safer one.

It's just a pity he does not realise how many newbies may have read his first post in the intervening 17days of inactivity.
__________________
regards Andrew T.
  Reply With Quote
Old 23rd March 2008, 05:49 PM   #26
gootee is offline gootee  United States
diyAudio Member
 
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
Quote:
Originally posted by AndrewT
Hi Gootee,
I have already sent him a private message with instructions on where to find the less dangerous disconnecting network and how to contact the moderators to remove the dangerous diagram and substitute the safer one.
Very good.

Quote:

It's just a pity he does not realise how many newbies may have read his first post in the intervening 17days of inactivity.
Agreed.
__________________
The electrolytic capacitors ARE the signal path: http://www.fullnet.com/~tomg/zoom3a_33kuF.jpg
  Reply With Quote
Old 23rd March 2008, 11:59 PM   #27
BWRX is offline BWRX  United States
diyAudio Moderator Emeritus
 
Join Date: Jan 2005
Location: Pennsylvania
Quote:
Originally posted by AndrewT
contact the moderators to remove the dangerous diagram and substitute the safer one.
The image is hosted on photobucket. All that needs to be done is to change the link url in the post to the url of the new image. Post the url of the new image and we can change it.
__________________
Brian
  Reply With Quote
Old 24th March 2008, 01:01 PM   #28
diyAudio Member
 
gainphile's Avatar
 
Join Date: Dec 2007
Location: Melbourne the sunny city!
The updated diagram is :

http://i188.photobucket.com/albums/z...Grounding2.jpg

How do I update the 1st post? ...
__________________
http://gainphile.blogspot.com
  Reply With Quote
Old 24th March 2008, 01:10 PM   #29
diyAudio Member
 
gainphile's Avatar
 
Join Date: Dec 2007
Location: Melbourne the sunny city!
Quote:
Originally posted by Mike514ml
I realize that the exact wire gauges may not be critical, but could you give me an idea of the relative sizes of the small, medium and huge ground wires?

Also, I'm currently finishing up a BrianGT 3875 dual mono chipamp kit (it's been lying around here for a LONG time), and was wondering if it would reduce the hum and thump potential more if it's built with single or dual power supply boards.
Hi Mike, I don't understand about wire gauges so I posted that picture (I have medium-size thumb ). Basically the largest wire is from good speaker cable about 4mm in diameter, the smallest is jumper cable about 0.5mm diameter. The middle size is about 1.5mm diameter.

Mine is built using single supply board for 4 channels. I don't know how using 4 PSU will help more as my amp is very quiet ie. no hump/thump...
__________________
http://gainphile.blogspot.com
  Reply With Quote
Old 24th March 2008, 02:22 PM   #30
BWRX is offline BWRX  United States
diyAudio Moderator Emeritus
 
Join Date: Jan 2005
Location: Pennsylvania
Quote:
Originally posted by gainphile
The updated diagram is :

http://i188.photobucket.com/albums/z...Grounding2.jpg

How do I update the 1st post? ...

You can only edit your posts for up to 30 minutes (I think) after posting. After that you need to ask a moderator to do it.

I've updated the url in your first post so the correct diagram should now show up.
__________________
Brian
  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
New problems with old Gainclone... sek Chip Amps 13 3rd February 2008 11:48 PM
Pass X150 power down Thump solution = Jensen Isomax (RCA to XLR converter)?? kmtkwong Pass Labs 3 10th October 2007 10:45 PM
My Gainclone PCB - Problems? shyfx Chip Amps 20 5th July 2005 11:56 AM
Gainclone Problems; Aahh! raffir Chip Amps 12 22nd April 2003 09:56 PM
the final solution to jitter and PLL problems? hifiZen Digital Source 3 27th June 2002 10:10 AM


New To Site? Need Help?

All times are GMT. The time now is 12:19 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