TPA3255 - all about DIY, Discussion, Design etc

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#2,442
RogerMont said:
The picture of the top of the board shows extra components by the right most TPA3255. Bet those select what mode the device works in. If they put tracking on the output side they're sure to have provided some component population options to enable it.
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That's an interesting theory! They have two missing SMD components titled NC. And 5 0R resistor. You can tell this from the picture you mention.
How would I go about figuring out how to do what? Trace the paths on the PCB? Can you tell how many layers such a board has? I can see paths on both the top and bottom side. 🙂
 
#2,443
Okay, so I've never done stuff like this before. Tracing pcb paths and diagrams.
But it seems as though RogerMort was correct! Thanks a ton!

I traced the M2 pin on the chip, and it seems it is currently pulled to ground with the left 0R resistor. The empty 'NC' right beside it connects the pin to voltage. Very interesting!
So I gotta go about remounting SMD components now. Never done that before. 🙂
I'll let you all know how it goes!

20200814-192708.jpg
 
#2,445
I want to ask you all.

3e audio TPA3255 amplifier board 12V REg-IC, old model EAUMT-0260-2-A and EAUMT-0480-1-A use LM7812, new model EAUMT-0260-2-B and EAUMT-0480-1-B use LM78M12. The maximum input voltage of these Reg IC is 35V. However, the specifications of the product allow it to be use with a maximum power supply of 51V. Since the circuit diagram has not been published, it is impossible to investigate further, but is this working voltage correct?

I purchased these amplifiers, but the 48V power supply causes the Reg-IC to heat up so much that I cannot use it with confidence. Therefore, I am currently using a 32V power supply.
The recently purchased AIYIMA A07 uses an Rrg-IC with a sufficiently high withstand voltage.
 
#2,448
Good evening everyone.
I bought the TPA3255 from 3e Audio, but it still hasn't arrived.
From what I could see it is a new version.
It is two-channel.
I read the whole topic and I may not have seen it, so I ask.
What is the sensitivity of this card's input in unbalanced mode? How many Volts or mV does it take to excite the amplifier well?

Thank you.
 
#2,450
Gain for the 3e audio TPA3255 at 1kHz is listed as 21.5 dB. That's a hair less than a ratio of 1 to 12. My Rev. B amp arrived very quickly in the US. It took a little more than 2 weeks to get here with about half of that time spent in the US according to the tracking info.
 
#2,452
grufti said:
Gain for the 3e audio TPA3255 at 1kHz is listed as 21.5 dB. That's a hair less than a ratio of 1 to 12. My Rev. B amp arrived very quickly in the US. It took a little more than 2 weeks to get here with about half of that time spent in the US according to the tracking info.
Click to expand...

Thank you!!
In reality, this 21.5dB gain translates to how many volts at the input? 2V as TOKU recommended?
My amplifier arrived in Brazil a week ago, but the postal service here is a real shame, like many other public services.
I am very much looking forward to it arriving so that I can hear it.
I read the whole topic and curiosity was keen to compare it with my reference system also DIY, but class AB with Mosfets on the audio output.
 
#2,454
Claredes: search for this article....

"Build Your Own Professional-Grade Audio Amp on the Sort of Cheap"

They used 18000 uF. I tried this approach using the previous version of the 3e Audio’s TPA3255 260W 2ch amp but I preferred how the amp sounded with 3e’s 38V SMPS. I just got the new version of the amp and it sounds so much better. I’ve been rolling through op-amps now that’ is so easy to do so. However, I will revisit the linear PS again with the new board.

Cheers,

Pete
 
#2,455
Interesting comment on the new board SQ improves on the old one. I have the original version and I'm going to swap out those bigger SMD caps like the rev.b board. Not sure I'll attempt op amp swapping. I'll be trying Muse ES and Silmic II for the caps

I use a big old 535VA 35V trafo. 2200uF Panasonic FC x 5 onboard the amp and 14 x 2200uf PSU. 0.1uf film bypass on each of the electrolytics. Huge overkill im sure but don't we like building things on here?! 🙂
 

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#2,456
turion64 said:
Claredes: search for this article....

"Build Your Own Professional-Grade Audio Amp on the Sort of Cheap"

They used 18000 uF. I tried this approach using the previous version of the 3e Audio’s TPA3255 260W 2ch amp but I preferred how the amp sounded with 3e’s 38V SMPS. I just got the new version of the amp and it sounds so much better. I’ve been rolling through op-amps now that’ is so easy to do so. However, I will revisit the linear PS again with the new board.

Cheers,

Pete
Click to expand...

Thanks for the answer.

I still couldn't search the article you recommended, but from what I could understand from your experience, high capacitance at the output was not so advantageous, so did you prefer to use the SMPS from 3e Audio or did I get it wrong?

The SMPS I find here are classified as ideal for LED power. And I read in the topic that these are not suitable for the amplifier in view of its dynamic consumption.
Another detail is that since I already have power transformers and capacitors, I thought, why spend more money when I can enjoy what I have here.
If i have no other choice, i then go to one of the SMPS that sells in the local market.

Greetings
 
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#2,457
jimk04 said:
Interesting comment on the new board SQ improves on the old one. I have the original version and I'm going to swap out those bigger SMD caps like the rev.b board. Not sure I'll attempt op amp swapping. I'll be trying Muse ES and Silmic II for the caps

I use a big old 535VA 35V trafo. 2200uF Panasonic FC x 5 onboard the amp and 14 x 2200uf PSU. 0.1uf film bypass on each of the electrolytics. Huge overkill im sure but don't we like building things on here?! 🙂
Click to expand...

Very cool your capacitor bank.
Do you think I would do well with a 20.00uF linear power supply?
For now I do not intend to change anything in 3e Audio, first I want to hear it as it comes from the factory, to compare with other amplifiers that I have. The changes will come in the future.
I am concerned with this issue of the PSU Linear and the ideal capacitance and the level of the audio input signal. I will need a preamp with 2V output. My signal source has a 750mV output.

greetings
 
#2,458
Excuse me for so many questions.
Another option I have.
I have an original X-BOX 360 SMPS that is specified at 12V 16.8A.
Would it be good for me to use this unit with a step-up converter set to 48V on its output?
Would the step-up converter introduce noise into the amplifier?
I get a 600W step-up at a good price in the local market.
I do not intend to use the amplifier at full power, my normal use should not exceed 20 or 30W, so in my understanding a 600W step-up would be adequate. But I may be sadly mistaken.: p
 
#2,459
claredes said:
Thanks for the answer.

I still couldn't search the article you recommended, but from what I could understand from your experience, high capacitance at the output was not so advantageous, so did you prefer to use the SMPS from 3e Audio or did I get it wrong?

The SMPS I find here are classified as ideal for LED power. And I read in the topic that these are not suitable for the amplifier in view of its dynamic consumption.
Another detail is that since I already have power transformers and capacitors, I thought, why spend more money when I can enjoy what I have here.
If i have no other choice, i then go to one of the SMPS that sells in the local market.

Greetings
Click to expand...

Here’s the link. It may or may not come through correctly on a post to the forum:

Full Page Reload

spectrum.ieee.org/consumer-electronics/audiovideo/build-your-own-professionalgrade-audio-amp-on-the-sort-of-cheap

I did prefer the 3e SMPS (38V model) over the toroidal+Xkitz PS....but, that was with the older version of 3e’s amp board.

Pete
 
#2,460
jimk04 said:
Interesting comment on the new board SQ improves on the old one. I have the original version and I'm going to swap out those bigger SMD caps like the rev.b board. Not sure I'll attempt op amp swapping. I'll be trying Muse ES and Silmic II for the caps
Click to expand...

Jimk04: the newer boards come with Silmics in place of the polymer caps (and they’re thru-hole as well). The op-amps I’m liking best on the new 3e board are the muses8820 or the opa1656. But, even with the stock 5532s that come with the board I could hear a difference from the older board right away.

Pete
 
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