Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

Amplifier sounds lagging
Amplifier sounds lagging
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 3rd April 2019, 06:31 PM   #1
shovon is offline shovon
diyAudio Member
 
Join Date: Jan 2019
Exclamation Amplifier sounds lagging

Hi folks!!
I need help with my tda8954th btl (420x2watts)amplifier. I made this amplifier with a 1000va toroid transformer (25V-0-25V) with 4 22000uf 63v capacitors with ne5532 op amp volume control board. I have used 300watts passive 3way volume filters. On my subwoofer I used 2 Sony 60watts 6ohm bookshelf in series on each side (12ohm total). I having issue with sounds lagging like bad cd reading type when I turn my volume up above 35-40%. I am using a Bluetooth receiver with that opamp. With low volume it's sounds great clear and massive bass. By the way I have used 1uf non polar capacitors in parallel with my transformer input and 1 capacitor in my transformer secondary with 25v & 25v legs did not use any non polar capacitors in my ground connection. Any idea guys what is wrong with my system??
  Reply With Quote
Old 3rd April 2019, 06:39 PM   #2
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
Possibly the input stage is receiving a part of the RF power radiated from the output: cables, filters, not grounded heat sinks, wiring, etc. Try to minimize lengths of cables and maximize distances between low and high level conductors.

Does your circuit have RF filtering (Passive LC) or it applies RF directly to voice coil?
__________________
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
Argentine Ham Radio LW1DSE since 1987.
  Reply With Quote
Old 3rd April 2019, 10:48 PM   #3
shovon is offline shovon
diyAudio Member
 
Join Date: Jan 2019
I got 4 output inductors to my amplifier circuit and my passive 3way crossover I have installed right above my chassis, yes it's possible there distance pretty close to each other and it's possible my opamp not so far to them. Problem is my main amplifier produce huge amounts of watts when load is below 8 ohm. I have checked my output stage voltage and amps it's close to 800watts at 4ohm load on one channel.
  Reply With Quote
Old 4th April 2019, 12:16 PM   #4
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
diyAudio Member
 
Osvaldo de Banfield's Avatar
 
Join Date: Dec 2011
Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
It isn't a problem of power, the problem arises from currents that creates magnetic fields around conductors, and voltage that creates electric fields. Bot of them can be like small antennas (Aerials) and the input wires too, then unavoidable coupling between them. More over with the high frequency high current high voltages present in this kind of amps. Try better shielding and or more distance between the small and high signal levels.
__________________
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
Argentine Ham Radio LW1DSE since 1987.
  Reply With Quote

Reply


Amplifier sounds laggingHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
my speaker sounds different with different amplifier :( rekotomo Multi-Way 12 21st December 2014 04:51 PM
Valve amplifier sounds great nigelwright7557 Tubes / Valves 5 27th May 2013 04:46 PM
Why this sounds so god... edinm Full Range 0 2nd January 2012 03:06 PM
Value of a Threshold 400a amplifier? - does it sounds good? centaurus3200 Pass Labs 6 19th April 2007 07:57 PM


New To Site? Need Help?

All times are GMT. The time now is 04:13 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki