Need help reducing noise of Amp! - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 8th February 2010, 05:15 PM   #1
tommy1 is offline tommy1  United States
diyAudio Member
 
Join Date: Jan 2010
Default Need help reducing noise of Amp!

Hi everyone!
Please help me to reduce noise from my amp even the Vol. is down completely, the noise"U` u` u`" from the speaker is still there.

Thank you!
PD
  Reply With Quote
Old 8th February 2010, 05:44 PM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
what's the amp? What is connected to it?
Have you measured anything?
__________________
regards Andrew T.
  Reply With Quote
Old 8th February 2010, 05:47 PM   #3
diyAudio Moderator Emeritus
 
Iain McNeill's Avatar
 
Join Date: Oct 2007
Location: Santa Cruz, California
are we talking mains hum or white noise?

a picture of the amp innerds would help, a schematic would be even better.
  Reply With Quote
Old 8th February 2010, 05:49 PM   #4
tommy1 is offline tommy1  United States
diyAudio Member
 
Join Date: Jan 2010
Hi Andrew!

2sc5200, 2sa1943(output Transistors) . 2sc669, 2sb649, 2sc2705, 2sa1145.
Only speakers connected to the Amp .
PD
  Reply With Quote
Old 8th February 2010, 05:52 PM   #5
tommy1 is offline tommy1  United States
diyAudio Member
 
Join Date: Jan 2010
This amp belongs to a small company(HOMEbusiness) I bought it a long time ago. I call them ,they said that they won't provide anything unless send it in for repair. And I did fix it but the only problem is the noise.
thanksss!
PD
  Reply With Quote
Old 8th February 2010, 06:13 PM   #6
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
It's not enough to go on...
If it all works and nothings blown as such, then it might be a power supply fault... maybe an open circuit cap etc or a regulator fault.

Need to see a circuit really... no idea at all what the amp is. Is it stereo (2 channels) are both channels faulty ? etc etc
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 8th February 2010, 06:33 PM   #7
tommy1 is offline tommy1  United States
diyAudio Member
 
Join Date: Jan 2010
...the thing is that I took the broken part out(UPC1237HA: audio circuit protector for the speaker relay, and I've been waiting for the part). I am getting the audio output signals before the relay. The sound is normal, except the noise even I turn the VOL. down completely.
  Reply With Quote
Old 8th February 2010, 06:55 PM   #8
tommy1 is offline tommy1  United States
diyAudio Member
 
Join Date: Jan 2010
Click the image to open in full size.[IMG]file:///C:/Users/p/AppData/Local/Temp/moz-screenshot-9.png[/IMG]

I cannot send the pic. from my email. Please help!!!
  Reply With Quote
Old 8th February 2010, 08:00 PM   #9
diyAudio Member
 
PhaseLockLoopy's Avatar
 
Join Date: May 2008
Location: On a mushroom
Default hummmmmmmmmmm

Hum likes it when nV/√Hz gets converted into V/√Hz Hum likes a ground loop to have a different potential

It’s so nice to hum
__________________
Hum likes to have a nice "Noise to Signal" ratio
To "Hum" is to be noticed Quality hum is when it pours out of Electrostatic speakers
  Reply With Quote
Old 8th February 2010, 09:58 PM   #10
tommy1 is offline tommy1  United States
diyAudio Member
 
Join Date: Jan 2010
...how to fix this problem??
  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
Reducing regulator noise. Predator864 Power Supplies 3 23rd March 2008 07:26 PM
reducing dc offset on sub plate amp? crippledchicken Solid State 3 6th October 2007 05:06 AM
Reducing noise in voltage regulators Sud Solid State 114 28th November 2006 06:47 AM
Reducing preamp/amp voltage gain? Stubb Solid State 1 1st November 2004 08:35 PM
Reducing Super Leach amp power supernet Solid State 9 10th March 2002 09:16 PM


New To Site? Need Help?

All times are GMT. The time now is 05:51 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