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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 12th July 2017, 03:32 PM   #11
SanjeevM is offline SanjeevM
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Though the difference is small.

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Old 14th July 2017, 02:30 PM   #12
diytoon is offline diytoon  Belgium
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Join Date: Mar 2005
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Default Board arrived today...

Wow sent on wednesday and now I am already listening to it...good service!
3e-audio/tpa3255 board that is...

First I had powered it with 25vdc...could not get any sound...
Raised to 36 vdc, started playing at around 28vdc...

Almost dead quiet (just a little noise when I put my ear next to the high eff speaker...no noise in my listening seat)

Very good sound out of the box...I will continue listening for a few more days...sounds promising.

Any advice on the psu?
I am using 12vdc car battery with dc/dc covertor to get 36vdc...works flawless...
Never tried a heavy smps power supply or something like that...

Tony
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Old 14th July 2017, 03:04 PM   #13
DPH is offline DPH  United States
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With your dc/dc converter, you're not really that far off a mains supplied smps anyhow. I'd not expect much different, unless your present setup is current limited.
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Old 14th July 2017, 03:19 PM   #14
diytoon is offline diytoon  Belgium
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Quote:
Originally Posted by DPH View Post
With your dc/dc converter, you're not really that far off a mains supplied smps anyhow. I'd not expect much different, unless your present setup is current limited.
No current limits on the battery side...the convertor has a limit of 10A...
But I do not think I ever will need that...the board is not driving subwoofers at full power...

I saw a psu on the 3e-audio site and was wondering if this would give me an advantage over my battery powered solution...

Anyway...sounds very good as it is now...
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Old 15th July 2017, 11:39 AM   #15
diytoon is offline diytoon  Belgium
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Join Date: Mar 2005
Location: belgium
Default After two days playing music

Warmed up, 36vdc powered...

Lots of detail and power, but lacks some power in the low frequenties...
For the moment I still prefer my tpa3116 yj blackboard...

Btw, I tried a few, must stop now and listen more to music...
Click the image to open in full size.

Other users of this tpa3255 board here?
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Old 16th July 2017, 09:26 PM   #16
diytoon is offline diytoon  Belgium
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Something was eating my bass...found it...my dc convertor does not like a big (10.000uF) capacitor on the output...
Removed the cap and now the sunnis shining...
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Old 17th July 2017, 05:00 AM   #17
SanjeevM is offline SanjeevM
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Are you using a switching supply? What is its Ampere rating please.

How much better than 3116 now?
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Old 17th July 2017, 07:49 AM   #18
diytoon is offline diytoon  Belgium
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Quote:
Originally Posted by SanjeevM View Post
How much better than 3116 now?

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A little more power
A little more noise on the output
Same musicality

I use a 12vdc car battery and dc covertor to 36vdc/10A

Maybe I must trie the 3e-audio power supply as well...
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Old 17th July 2017, 01:54 PM   #19
SanjeevM is offline SanjeevM
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Join Date: Jun 2017
Yes, perhaps the up convertor doesnt provide sufficient current.

My experience with switching supplies is that they are too noisy. I am changing to a linear supply as soon as my trafo gets delivered.

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Old 17th July 2017, 02:46 PM   #20
irribeo is offline irribeo  Netherlands
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You have a switching supply on your ampboard too. And a switching amp.
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