One interesting packaged TPA3255.
TPA3255 ad alta potenza in classe D febbre digitale 2.0 amplificatore di potenza (300 w + 300 w) amplificatore Bluetooth 4.2 in TPA3255 ad alta potenza in classe D febbre digitale 2.0 amplificatore di potenza (300 w + 300 w) amplificatore Bluetooth 4.2da Amplificatore su AliExpress.com | Gruppo Alibaba
TPA3255 ad alta potenza in classe D febbre digitale 2.0 amplificatore di potenza (300 w + 300 w) amplificatore Bluetooth 4.2 in TPA3255 ad alta potenza in classe D febbre digitale 2.0 amplificatore di potenza (300 w + 300 w) amplificatore Bluetooth 4.2da Amplificatore su AliExpress.com | Gruppo Alibaba
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...
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...
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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...
I replaced the stock op amp (TLO72) with OPA2132. Fo now ths the mods I did. I bought in arrow.com
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 10µF/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....
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?
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?
As I understand it you definitely could use any of those, however that would be a waste of their capabilities. Driver ICs are designed to drive long lines of unpredictable impedance, floating outputs etc etc. Here you only need the SE>diff converstion part, hence standard opamps are plenty functional.
TI has a note on TPA1632 (fully differential opamp) as an input stage, definitely a good read but the benefits over dual opamps are not overwhelming.
Sorry guys for repeating off topic question but anyone has a click noise when 3255 goes Off? The problem is I have Off click with 3251, and I asking because believe these two IC should have the same On/Off behavior. Click noise is quite loud on my 92dbmW and in my opinion, it is not acceptable, however, I've no idea what I can do if On/Off is only making the RESET pin with no any options? The On click is much less and for sure acceptable.
There seems to be a new revision (Q1) of the tpa3255 chip http://www.ti.com/document-viewer/TPA3255-Q1/datasheet/features-slasea86513#SLASEA86513
I can't find what changed, but the EVM boards are finally send to Europe, so maybe some minor thing to comply to some stupid rule of our owners to keep us busy.
I can't find what changed, but the EVM boards are finally send to Europe, so maybe some minor thing to comply to some stupid rule of our owners to keep us busy.
Thanks, I'm guessing you meant OPA1632
And yes, I see there's an evaluation module which can be used as an input stage for the TPA3255 amp -
http://www.ti.com/tool/tida-01359?jktype=design
The reason for my query is that I have a TPA3250 EVM board (which is in the process of being wired and cased up) and I have gone to a certain amount of effort to completely bypass the input stage, so that I can experiment with alternative input stages - transformer, tube, and balanced opamp outputs directly from a DAC.
In hindsight I should have bought the TPA3255 EVM instead - because it appears to have a header which provides direct access to the TPA3255 chip, thus avoiding the modifications which I have had to perform to the TPA3250 board.
Yes, my mistake
The writeup I was referring to:http://www.ti.com/lit/ug/tidud13/tidud13.pdf
Please do report on your findings if you go the hardcore experimenter's route
Yes, my mistake
http://www.ti.com/lit/ug/tidud13/tidud13.pdf
Please do report on your findings if you go the hardcore experimenter's route
I guess the scale at figure 2 is wrong
Power (W)....
-Q1 states AEQ-100 qualification which implies higher allowed ambient operation temperature range (105°C).
Compared to TPA3255, the TPA3255-Q1 differs in:
GVDD, VDD, which is lowered from nomial 12V to 10.6V. Checking absolut maximum ratings, the -Q1 isn't design compatible with the standard one, as 12V will be to high.
(I'd think it is just a derating to provide the 105°C Class2 AEC-100 qualification. I don't expect them to fabricate a different design for the -Q1)
I ordered 2 Aiyima boards around New years, this is what I got... Single regulator for the 12V line, one for 3.3V. One has inductor 220, the other 102... Capacitors are equally strange, will have to change all of them. Of course no Elna caps as promised in the description . LEDs are always on, upon clip fault one of them goes out. Other than random variations in components the boards work, have no turn on/off thumps and are built quite decently
. LEDs are always on, upon clip fault one of them goes out. Other than random variations in components the boards work, have no turn on/off thumps and are built quite decently
