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Class D Switching Power Amplifiers and Power D/A conversion

What is wrong with TPA3255?
What is wrong with TPA3255?
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Old 18th July 2017, 03:42 AM   #21
SanjeevM is offline SanjeevM
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The higher order harmonics generated by the PS go to the amp and play havoc with its switching, unless there is a filter circuit in between

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Old 18th July 2017, 03:46 AM   #22
SanjeevM is offline SanjeevM
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Well, thats what is my view. I havent tried out a linear PS on a switching amp yet.

I did feed the RPi + Boss with a buck convertor. The sound quality took a nosedive. When I restored the Allo adapter, which is switching but presumably generates lesser noise, SQ got restored.

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Old 18th July 2017, 07:17 AM   #23
irribeo is offline irribeo  Netherlands
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Your 3116 ampboard has no decoupling/high frequency filtering, it is switching 400kHz, you feed it with switching psu and you like it and you said everybody that hears your setup likes it. All that amp ripple/noise and your smps ripple/noise added, unfiltered, and you like it. You may not like the filtered tpa3255, curious to read your eval post when you have listened to that better filtered one.
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Old 18th July 2017, 05:26 PM   #24
SanjeevM is offline SanjeevM
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Quote:
Originally Posted by irribeo View Post
Your 3116 ampboard has no decoupling/high frequency filtering, it is switching 400kHz, you feed it with switching psu and you like it and you said everybody that hears your setup likes it. All that amp ripple/noise and your smps ripple/noise added, unfiltered, and you like it. You may not like the filtered tpa3255, curious to read your eval post when you have listened to that better filtered one.
Yes, what you say is indeed true. I have a Volt+ amp too, which has supply filtering built on board with a 3118 chip. Curiously, the 3116d2 Chinese XH board plays better!! I can't explain why, but that's the swap-out listening test result!!

I am waiting for the trafo, after which I will report again on the result after using a linear supply.

Last edited by SanjeevM; 18th July 2017 at 05:28 PM.
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Old 1st August 2017, 08:56 AM   #25
diytoon is offline diytoon  Belgium
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Join Date: Mar 2005
Location: belgium
Default bass lift

after a few weeks running in...

very good sounding amplifier.
the best sound so far, but I keep having problems with de bass SPL.

to correct it I using my Roon equalizer by lifting the bass with 6 dB from 120Hz downwards...

Strange, all my other amps do not have that gap in the bass region...
source is always the same, speakers are always the same as is the PSU...

3e has received my mail and will get back on this, to see what is causing this.

any one else using this board? would love to hear what others think of this amp...

Tony
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Old 1st August 2017, 09:15 AM   #26
Kjeldsen is offline Kjeldsen  Denmark
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This is cheap

Assembled TPA3255 Digital Amplifier Board (300W + 300W) | eBay
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Old 1st August 2017, 09:48 AM   #27
Kjeldsen is offline Kjeldsen  Denmark
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even cheaper :-)

https://www.aliexpress.com/item/DC50...8-06b11792c6d6
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Old 1st August 2017, 09:52 AM   #28
diytoon is offline diytoon  Belgium
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Quote:
Originally Posted by Kjeldsen View Post
Ordered one 10 days ago...is shipped...
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Old 1st August 2017, 10:35 AM   #29
Kjeldsen is offline Kjeldsen  Denmark
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Great, please follow up with listening impressions. I already have a Sinewave amplifier with TPA3251, and it does sound good in a biamped system (have used for a 4" fullrange, not the woofer)
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Old 1st August 2017, 01:20 PM   #30
SanjeevM is offline SanjeevM
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Diytoon had posted a message here regarding the tpa3255.



I wonder where it's gone?
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