TDA8920BJ noise issues - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 9th July 2009, 09:23 PM   #1
icko is offline icko  Sweden
diyAudio Member
 
Join Date: Sep 2008
Question TDA8920BJ noise issues

Hi lads

I've built a mixer + phase rotator + 2 low passfilter + linkwitz filter + gainstage + bridged subwoofer amp with TDA8920BJ. I have som problems with noise. I think the output noise seem fairly high but also sometimes there is some "screeching" noise sounds that is not related to when music is on.

Anyone built anything with TDA8920BJ with similar experiences? I have cruised around forum for hints but can't really find any obvious mistakes I've done. Maybe put the output inductors a little bit close. I bought the chips on ebay, i've searched but not found any complaints on fake TDA8920 IC's from ebay.

here are some pictures of the PCB and semi-assembled PBA.

http://img195.imageshack.us/i/bottomy.jpg/
http://img525.imageshack.us/i/topgee.jpg/
http://img22.imageshack.us/i/backboq.jpg/
http://img156.imageshack.us/i/frontdnf.jpg/
http://img11.imageshack.us/i/leftbqo.jpg/
  Reply With Quote
Old 12th July 2009, 07:56 PM   #2
icko is offline icko  Sweden
diyAudio Member
 
Join Date: Sep 2008
after listening further i noticed that the really loud noise starts to come in bursts after it has played around 15 minutes. before that, nothing...

I first believed it was due to thermal issues but the chip is not hot at all.

no one has any clue?
  Reply With Quote
Old 9th April 2010, 06:35 PM   #3
diyAudio Member
 
Join Date: Apr 2010
can you help me and send schematic and full circuit diagram
  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
Low noise transistor and noise figure Real_Macgyver Solid State 28 27th July 2012 09:42 AM
PCB layout for TDA8920BJ wanted Primoz Class D 32 13th April 2012 07:53 AM
GC noise and heat issues fishski13 Chip Amps 33 9th July 2009 11:59 AM
IP issues GRollins The Lounge 25 10th July 2007 05:43 AM


New To Site? Need Help?

All times are GMT. The time now is 01:17 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