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 10th December 2005, 04:45 AM   #1
diyAudio Member
 
Jimmy154's Avatar
 
Join Date: Jun 2002
Location: NH, USA
Default gainclone: one channel buzzes

I have a gainclone and one channel buzzes. It's a slight buzz and gets louder the later on in the day it gets. But my speakers are 2 ft away from me so I can hear it and it gets irriating. It has nothing to do with the transformer and rectifier. No matter how I wire the transformer it buzzes on the same channel. And I figure if it was the rectifier it would buzz on both. So where is the problem?
__________________
We do not allow political statements or conjecture to be made on these forums.---the diyAudio moderation team
  Reply With Quote
Old 10th December 2005, 06:10 AM   #2
diyAudio Member
 
neutron7's Avatar
 
Join Date: Dec 2003
Location: Toronto Canada
did you try swapping the inputs to see if the buzz comes from the other channel? iif it changes to the other side then its something to do with the source

its probably a ground loop or other grounding issue.

a picture or diagram of your ground wiring would help people to help you
  Reply With Quote
Old 10th December 2005, 06:45 AM   #3
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
Also make sure its not maybe one of the speakers... had that happen before... In the meantime, my money is on a bad solder joint.
  Reply With Quote
Old 10th December 2005, 04:48 PM   #4
diyAudio Member
 
Jimmy154's Avatar
 
Join Date: Jun 2002
Location: NH, USA
The inputs and the speakers are the first things I checked.

I resoldered everything cause I thought it was a bad solder joint too. It did not help Maybe it still could be a bad solder joint

Not sure how to draw a diagram, but I'll try to explain it. My two channels go to a 100 ohm resistor, then to the chassis where they meet up with my earth ground.
__________________
We do not allow political statements or conjecture to be made on these forums.---the diyAudio moderation team
  Reply With Quote
Old 11th December 2005, 01:06 AM   #5
diyAudio Member
 
Jimmy154's Avatar
 
Join Date: Jun 2002
Location: NH, USA
It was cause the right side channel signal input goes right by the power wires where the plug is, I think. I rewired it a little and I think it might be a little better now. When the signal input wire is not wired into the channel there is no buzz. You can wire signal wire into right channel and the other end can be run by the power wires and the buzz gets louder or fainter depending on how close it is to the power wires. Inbetween two power wires it is the loudest, like where the switch is. Should of tried it with left channel to confirm, now that I think about it.

Another thing I figured out while doing this is that the volume control or pot (is that what it's called?) I had in there before made it sound worse, I think. I had a pot from an old crappy amp, now I have a pot from an old H/K amp and it is much better.

Also power wire zapped me good haha
__________________
We do not allow political statements or conjecture to be made on these forums.---the diyAudio moderation team
  Reply With Quote
Old 11th December 2005, 07:36 AM   #6
diyAudio Member
 
Join Date: Sep 2004
Location: Cleveland, OH
Did you design the boards yourself, or are you using a point-to-point scheme?

In either case, make sure that the non-inverting input (or whereever you reference the amp to ground in your design) has it's own wire to the main signal ground. If there any voltage drops due to power supply filtering caps, etc in the ground path to the non-inverting input, the amplifier will amplify the slight differential input.

I made this mistake on one of my boards and had to cut the ground traces to solder leads on!
  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
Building a 5 channel GainClone Kevinwil Chip Amps 6 5th January 2007 04:03 AM
Guitar Amp buzzes off of power inverter, will this filter work? silentblackhat Solid State 14 9th November 2006 11:39 PM
Gainclone has 1/8-1/4 the volume one channel Jimmy154 Chip Amps 15 25th June 2006 05:21 PM
DAC buzzes and hisses with Denon DVD3910 but not old DVD player HeadSh0T Digital Source 6 13th May 2005 05:07 AM
How many toroids for 10-channel gainclone? ftjandra Chip Amps 5 22nd May 2004 06:59 PM


New To Site? Need Help?

All times are GMT. The time now is 07:57 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