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

TPA3116D2 Amp
TPA3116D2 Amp
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 15th October 2019, 02:30 PM   #11241
Kyrk is offline Kyrk  Greece
diyAudio Member
 
Join Date: Jul 2019
Location: Athens
Quote:
Originally Posted by phofman View Post
Very likely there are outlets in Greece with old PC equipment where a class II notebook adapter (i.e. 2 pins) will be for next to nothing...
I am not sure what you mean.
  Reply With Quote
Old 15th October 2019, 06:26 PM   #11242
phofman is offline phofman  Czech Republic
diyAudio Member
 
Join Date: Apr 2005
Location: Pilsen
Ground loops are by far the most common problem with connecting desktop PCs to audio equipment. New posts about ground loops problems pop up constantly.

So you need to eliminate the ground loop. IMO the easiest and most reliable thing in this case is to use an insulation class II power adapter for your amp Appliance classes - Wikipedia which does not use the protection earth wire (which creates the ground loop in your case).

USB soundcard may not help, if the ground of the USB output on the motherboard is still far away from the PSU terminal and the board carries large currents in the return section used by the USB ground. It is often the case.

Any older notebook adapter will do, provided it has enough power. In my project I measured the TPA3116 distortion and powered with 20V, the distortion started rising at 2x18W/8ohm. IMO 60W for your 3ch setup will suffice, 90W would be better. I am sure if you search shops with used PC/old junk in Greece, you will find such an adapter for almost free. Otherwise buy from ebay from Europe, e.g. Genuine Original 2-Power 19.5V 4.61A 90W AC Power Supply Charger Adapter PSU | eBay
  Reply With Quote
Old 16th October 2019, 04:23 PM   #11243
Turbowatch2 is online now Turbowatch2  Germany
diyAudio Member
 
Join Date: Aug 2013
Location: Northern germany
You are right, ar 40 Euros this sound card is not worth it. I got one for 12 Euros inc. P&P.
I needed something driven by a laptop with linear response and a 5 Volt microphone input + an optical output, which it does very well. For loudspeaker measurements there is not really much sense in anything sampling more than 48kHz.

Concerning the passive transformer. Ask you self what you want: You want to have no DC to keep noise away. Any audio device will have a roll off at two sides of the spectrum, if it is not DC coupled. So there will be, maybe -3dB at 20 Hz and 20 kHz. Now ask yourself again, what does your sound system deliver? Be honest, sub 40 Hz is not realistic. If you have a roll off, just push the bass up a notch and you compensated for this. What negative effects do you think, has a reversed phase? Just a tipp: The music does not play backwards.
In this forum the stupid talk is filtered out a bit, other forums are lead by the most stupid talkers...

In the end, you have to try your self. The Dynavox will work, change the sound subjectively a little, as you never will be able to do a perfectly leveled A/B comparison.
In a blind test some will like the transformer "sound" even better, just like some like tubes in the audio chain.

PS Ah, China. No I just yesterday got some stuff, perfectly in time. I mentioned that you have to plan in advance, a little, as the transfer times may vary. Like at our homes, there are quick and slow working company´s.

Last edited by Turbowatch2; 16th October 2019 at 04:27 PM.
  Reply With Quote
Old 17th October 2019, 02:01 PM   #11244
Kyrk is offline Kyrk  Greece
diyAudio Member
 
Join Date: Jul 2019
Location: Athens
Quote:
Originally Posted by Turbowatch2 View Post
You are right, ar 40 Euros this sound card is not worth it. I got one for 12 Euros inc. P&P.
I needed something driven by a laptop with linear response and a 5 Volt microphone input + an optical output, which it does very well. For loudspeaker measurements there is not really much sense in anything sampling more than 48kHz.

Concerning the passive transformer. Ask you self what you want: You want to have no DC to keep noise away. Any audio device will have a roll off at two sides of the spectrum, if it is not DC coupled. So there will be, maybe -3dB at 20 Hz and 20 kHz. Now ask yourself again, what does your sound system deliver? Be honest, sub 40 Hz is not realistic. If you have a roll off, just push the bass up a notch and you compensated for this. What negative effects do you think, has a reversed phase? Just a tipp: The music does not play backwards.
In this forum the stupid talk is filtered out a bit, other forums are lead by the most stupid talkers...

In the end, you have to try your self. The Dynavox will work, change the sound subjectively a little, as you never will be able to do a perfectly leveled A/B comparison.
In a blind test some will like the transformer "sound" even better, just like some like tubes in the audio chain.

PS Ah, China. No I just yesterday got some stuff, perfectly in time. I mentioned that you have to plan in advance, a little, as the transfer times may vary. Like at our homes, there are quick and slow working company´s.
Thank you for your help. I decided to first check them with a Bluetooth adapter if the latency isn't bad i guess i will stay with that, otherwise i will order the dynavox isolator.
  Reply With Quote

Reply


TPA3116D2 AmpHide 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
FS- Twisted Pear Buffalo 32S Board & System New & Unused secretriches Swap Meet 1 10th August 2009 02:17 PM
Modify & build out (2) Western Electric 300B / 2A3 Hammond monoblock amps & UTC LS-5 quality sound Tubes / Valves 0 9th May 2009 03:59 PM
Krell KSA 80 bias & dc offset check & adjust procedure Clouseaupte Solid State 3 9th August 2007 09:39 AM
DIY-AMP <ZAS> Low THD & IM high bandwith murphy Solid State 18 30th December 2005 10:28 AM


New To Site? Need Help?

All times are GMT. The time now is 01:19 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