TPA3255 - all about DIY, Discussion, Design etc

[daniboun]

Hey gents, I'm about to start my first TPA3255 and would love to get some Sound Advice (forgive me).

Going with the 3e-Audio TPA3255. I have one of these suckers laying around collecting dust.

What are your thoughts on sizing and building for future flexibility? I was seriously considering the DAC board from 3e and building it in to the same housing but in reality, the larger housing size to fit all this (the SMPS is pretty big), makes things get expensive.

If you had a $200-250 budget (psu not included), what would you do?

I was thinking of going with this for the volume knob

Any other recommendations? Any preferred enclosure suppliers on AliE? So far, my SMPS and Amp take up about 265 mm x 280 mm x 45 mm.

Thanks!

Take a look at this modular TPA3255 board, by ChipDip. Good for DIY projects. (looking for flexibility)
linuxfan should like this

It is really interesting : you can choose each item separately

- you can remove OP Amps or add it
- choose the modulation filter
- choose any mode ; PBTL / Mono / 2.1 or 4 channels
etc

For the enclosure, I personnaly like this one, size is perfect for any kind of project with a really great price )

 

[mrgarison]

Thanks Dani, I'll take a look at those. How do they measure in quality and output compared to 3e?

 

[daniboun]

Thanks Dani, I'll take a look at those. How do they measure in quality and output compared to 3e?

Good question, I just read some comments on the Russian forums... I don't really speak Russian... but I found the comments very interesting and positive.

I'm a risk taker lol but I assume) but when I see the prices... it makes you want to try)
Everyone knows my enthusiasm on this forum lol Love it or hate it !


More sincerely, if I had $250 I would go; without hesitation, on an XRK or 360 Customs boards.

TPA3255 Reference Design Class D Amp GB

 

[drMordor]

Take a look at this modular TPA3255 board, by ChipDip. Good for DIY projects. (looking for flexibility)
linuxfan should like this

It is really interesting : you can choose each item separately

- you can remove OP Amps or add it
- choose the modulation filter
- choose any mode ; PBTL / Mono / 2.1 or 4 channels
etc

the worst amp I've seen But TPA325x forgives a lot of mistakes

 

[daniboun]

the worst amp I've seen But TPA325x forgives a lot of mistakes

Let's trust DrMordor ) Thanks for your opinion I know you are a specialist and really sharp in the matter

Take care Bro )

 

[hansueli]

So i checked thermal paste. Looks good.


The board is hard for desoldering... at 380°C it won't put all solder and the caps are still locked^^


For 65$ you get a really good amp. For 250$ you can get better but is the difference as big as the price???


I am still very happy.

 

[mrgarison]

the worst amp I've seen But TPA325x forgives a lot of mistakes

Thanks Dr!

 

[mrgarison]

So i checked thermal paste. Looks good.


The board is hard for desoldering... at 380°C it won't put all solder and the caps are still locked^^


For 65$ you get a really good amp. For 250$ you can get better but is the difference as big as the price???


I am still very happy.

That's a great point. One that I have thought about and which kept me leaning towards the 3e-audio version.

On that note, where would you direct the remaining $185 (250-65 Quick Math)? I'm talking, RCA connectors, Speaker terminals, DAC (scary word), etc. If you have a favorite supplier of these components, i'm all ears

I know this is not the spot to place the DAC-word, so if you prefer I can leave it out. More or less curious about individual experience using DAC's with these and if it is worth placing inside the same enclosure or keeping separate.

Once again, thanks for all the feedback everyone

 

[multisync]

Welcome back Owen it's been a while. I was thinking of getting another Tpa3255 board. Now ill wait for yours. Your headphone amp, LPUHP, amp and Lme49830 amps are all working fine.

 

[hansueli]

So guys I did it.... I change OPAMP and outputfilter.




I switcht with the balance but for me no difference... Amp drives 2 JBL AC2212 per channel. As pream I use a Behringer Xenyx 302 USB.


Some little changement in highs. Not much but my girlfriend also says modded one are better.









I don't know if I will take my MKP caps from my cheap china amp and solder them from bottom...

 

[daniboun]

So guys I did it.... I change OPAMP and outputfilter.
I switcht with the balance but for me no difference... Amp drives 2 JBL AC2212 per channel. As pream I use a Behringer Xenyx 302 USB.
Some little changement in highs. Not much but my girlfriend also says modded one are better.I don't know if I will take my MKP caps from my cheap china amp and solder them from bottom...

OP Amps, I guess LM49720 ?
Tell us more

 

[hansueli]

No its LME49725.


Right I have 4580 and left LME49725^^ So I can listen to both


But the difference is not big :-/

 

[nionios]

Hello to all,
I am trying to make my fist 2.1 boombox. I would like to be portable and also to use it outdoors. I have choose some parts (please check the links below) but I can not understand if it will be loud enough.

One from the woofers below
Dayton Audio DS135-8 5" Designer Series Woofer Speaker

Dayton Audio DC160-4 6-1/2" Classic Woofer Speaker

one set of full range speakers
Dayton Audio RS75-4 3" Reference Full-Range Driver 4 Ohm

Dayton Audio RS100-4 4" Reference Full-Range Driver 4 Ohm

Fountek FE85 3" Full-Range Speaker Driver

Amplifier
https://www.ebay.com/itm/TPA3116-2-...055929?hash=item420e32dcf9:g:pzkAAOSwZL5d7xS2

I am glad to hear your recommendations and also I would like ask if you are thinking that I have to built a crossover. How I can calculate any crossover?

 

[daniboun]

No its LME49725.


Right I have 4580 and left LME49725^^ So I can listen to both

But the difference is not big :-/

Thanks amigo ) nice to know

 

[Think]

@nionios: that amp is great; get 2 4Ohm woofers in sealed boxes/compartments to get a 2Ohm load. With 2 full range L-R drivers you don't need any crossover as it is in the amp. Better make your own topic as this has noting to do with TPA3255.

 

[lwj5]

Hi does anyone know how to calculate the Zobel values for a common-mode circuit? Now that there is a resistor and capacitor pair on both sides, I suppose it's different from the standard Zobel calculations.

Also, has anyone tried Wurth 2 in 1 inductor (1521 package)? From the datasheet they look fine to me.
I'm probably switching my AIYIMA to these WE-HIDA THT High Current Inductor | Passive Components | Wurth Elektronik Product Catalog

I'll also be bumping the LC filter inductor and capacitor values to 22uH and 0.33uF to match my speaker impedance.

 

[opc]

Welcome back Owen it's been a while. I was thinking of getting another Tpa3255 board. Now ill wait for yours. Your headphone amp, LPUHP, amp and Lme49830 amps are all working fine.

Hi John!

Glad to see you still on here

Also happy to hear all the amps are still in good order. I will you keep you posted on progress with the boards and with the results. Boards should be here next Wednesday and assembly will happen that evening.

Hope all is well, and I'll PM you to see how the rest of the Ottawa gang is doing.

Cheers,
Owen

 

[opc]

On a more TPA related note, I wanted to point out a curious finding that goes back quite a ways in this thread regarding inductors.

I have a Coilcraft AGP4233-103ME and a CODACA CPQ4228-100 both in-house now, and I had assumed these were the same part just with a re-brand from Coilcraft.

Physically speaking, that could not be further from the truth. These are completely different parts and are almost certainly not made in the same factory. From the datasheets, these should be identical. Both share identical DCR and exactly the same saturation current. All dimensions are identical between both parts on the datasheets as well.

In reality, the Coilcraft part is notably smaller (2mm shorter, and 1mm less tall) but weighs a surprising amount more (141g vs. 128g for the Codaca part). Given the metal clip parts are very close to the same size, this indicates the cores are made from different materials, with the Coilcraft part having a significantly denser core material.

See the attached images for the obvious visual differences as well.

I will test both carefully for distortion to see if there is any performance difference to go along with the obvious physical differences.

As a final note, these things are absolutely massive. I'd say at least 8-10 times the size of the stock output inductors from TI reference board.

Regards,
Owen

 

[daniboun]

On a more TPA related note, I wanted to point out a curious finding that goes back quite a ways in this thread regarding inductors.

I have a Coilcraft AGP4233-103ME and a CODACA CPQ4228-100 both in-house now, and I had assumed these were the same part just with a re-brand from Coilcraft.

Physically speaking, that could not be further from the truth. These are completely different parts and are almost certainly not made in the same factory. From the datasheets, these should be identical. Both share identical DCR and exactly the same saturation current. All dimensions are identical between both parts on the datasheets as well.

In reality, the Coilcraft part is notably smaller (2mm shorter, and 1mm less tall) but weighs a surprising amount more (141g vs. 128g for the Codaca part). Given the metal clip parts are very close to the same size, this indicates the cores are made from different materials, with the Coilcraft part having a significantly denser core material.
Regards,
Owen

Hi, thanks and really interesting.
What is your TI TPA32XX board for testing ?

I wonder what influence the inductors will have on TI EVM performances, looking forward to see it.

As reminder, see below THD / inductors influences (ref Board, top end TPA32XX 360 Customs, based on EVM spec)
it seems that flat wire coils are more efficient, especially those with a die cast core.

 

[hansueli]

I am thinkin of buyin to cheap HP 230W 19v Notebook powersupply. Two in series would give 38V and 430W... I that kind of supply good or would a cheap 48V supply from Ali or ebay the better choice?