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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 9th January 2019, 08:46 PM   #701
chermann is offline chermann  Austria
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well done...nice wood housing
sorry maybe i miss it...which psu do you use?


chris

Last edited by chermann; 9th January 2019 at 08:48 PM.
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Old 10th January 2019, 04:00 AM   #702
FerChin79 is offline FerChin79
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Thanks Chris. The psu is connexelectronic Smps300R 38v adjusted to 36v
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Old 14th January 2019, 06:41 PM   #704
chermann is offline chermann  Austria
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not easy to say what SQ compared to the normal YJTPA3255
but 40$ with housing.... but i guess that the blue thooth will give some noise, i read at other chip boards



this board looks very similar, ...or.....but its 2.1
GHXAMP TPA3255 Digital Hifi Amplifier Board 150W*2+300W Class D 2.1 Channel High Power Amplifier Board DC 30V 48V 1pc-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
so its not BTL = best performance
its SE...

Last edited by chermann; 14th January 2019 at 06:44 PM.
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Old 16th January 2019, 09:07 AM   #705
zeroFILL is offline zeroFILL  Viet Nam
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@FerChin79, @chermann: Can you guys tell what is the Op-Amp chip in your boards? Thanks!
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Old 16th January 2019, 09:31 AM   #706
chermann is offline chermann  Austria
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Quote:
Originally Posted by zeroFILL View Post
@FerChin79, @chermann: Can you guys tell what is the Op-Amp chip in your boards? Thanks!

on my first version of my board (with LM2575S + LM317 i had the TL072 (fakes)
on the second version of my board i had the LM2575T regulator and the TL072 too, but after some strange spike voltwide remind me that this could be lm538 or so = somthing worse than the TL072

...its postest earlier...
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Old 16th January 2019, 03:43 PM   #707
FerChin79 is offline FerChin79
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Quote:
Originally Posted by zeroFILL View Post
@FerChin79, @chermann: Can you guys tell what is the Op-Amp chip in your boards? Thanks!
I replaced the stock op amp (TLO72) with OPA2132. Fo now ths the mods I did. I bought in arrow.com
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Old 17th January 2019, 03:56 AM   #708
zeroFILL is offline zeroFILL  Viet Nam
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Thank you! I think that op-amps are very important but we seem to have no choice since every Chinese's TPA3255 boards have the same cheap op-amps
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Old 17th January 2019, 05:57 AM   #709
chermann is offline chermann  Austria
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Quote:
Originally Posted by zeroFILL View Post
Thank you! I think that op-amps are very important but we seem to have no choice since every Chinese's TPA3255 boards have the same cheap op-amps
after listening test with my first boards and with changed input caps...i changed it to 10F/16V elna silmic 2 its sounds not as bad!

Voltwide state a lot of pages before that this (original) old version of opamp is not bad sounding. i can agree....
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Old 27th January 2019, 03:14 AM   #710
linuxfan is offline linuxfan  Australia
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Still on the subject of opamps, can anyone offer an opinion why all of the TPA32xx boards currently available choose to use NE5532 (or equivalent) at the input for SE-to-differential conversion?

Why would they not use dedicated differential line-driver IC's such as THAT1646 or DRV134 or SSM2142 ? I would have thought that these dedicated IC's would be optimal?
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