3E Audio 260-2-29A : TPA3255 / HA3588 CoilCraft / PFFB Fully differential.

[antcollinet]

Yes, Sorry I was picking numbers at random to make my example.
I did not consider the 3e specs.
However this gives me a chance for another question.
With household electrical appliances we care to make sure the voltage is right and that the socket can provide at least the amount of current required. More is better.
In your reply you mentioned that the 3e board can take only 14 amps: does it mean we cannot have a psu that could provide more current than that?

No, the chip won't take more current than it can use. Or at least if it gets overloaded it will go into protection.

 

[daniboun]

Yes, Sorry I was picking numbers at random to make my example.
I did not consider the 3e specs.
However this gives me a chance for another question.
With household electrical appliances we care to make sure the voltage is right and that the socket can provide at least the amount of current required. More is better.
In your reply you mentioned that the 3e board can take only 14 amps: does it mean we cannot have a psu that could provide more current than that?

I am referring to the Texas Instruments recommendations and not 3E Audio), I quote :
If you refer to the table that I shared, you will be able to choose wisely according to the attributes of your speakers.

 

[bolzanis]

I am just thinking to start a new D class project Anybody tried this amplifier with Micro audio 630W SMPS?

SMPS600-R2 – MicroAudio

micro-audio.com

Wondering how this amplifier sounds compare to others (Purifi, AB class amps...) Any thoughts?

 

[antcollinet]

I am just thinking to start a new D class project Anybody tried this amplifier with Micro audio 630W SMPS?

SMPS600-R2 – MicroAudio

micro-audio.com

Wondering how this amplifier sounds compare to others (Purifi, AB class amps...) Any thoughts?

That PSU is inregulated. I'd not be using it for a class D amp:

It also has a bundle of un-needed aux supplies.

Power supply bus pumping
The SMPS630-SO is an unregulated SMPS, therefore bus pumping will occur when used with ClassD There are two possible solutions to overcome this issue.
1- Use extra capacitance at the output of the SMPS
2- Operate your amplifiers in out of phase configuration, in stereo mode.

 

[daniboun]

That PSU is inregulated. I'd not be using it for a class D amp:

It also has a bundle of un-needed aux supplies.

In one of my previous posts, we talked about it with 3E Audio. This power supply will work out of the box with the module but it is of little interest.
Basically the SMPS630-SO PSU was designed for the XRK modules (TPA3255)

But I maintain, it has little interest here and what's more, it takes up a lot of space in a case)

 

[daniboun]

I am just thinking to start a new D class project Anybody tried this amplifier with Micro audio 630W SMPS?

SMPS600-R2 – MicroAudio

micro-audio.com

Wondering how this amplifier sounds compare to others (Purifi, AB class amps...) Any thoughts?

If you want some tips, check here

"Bamboo Project" : Dual Mono 3E Audio 480-1-29A Amplifier

Hi amigos, Following the ASR review of the 3E Audio 480-1-29A Module, I decided to roll up my sleeves and show you that with a little elbow grease, you can create a very beautiful amplifier based on these nice 3E Audio modules. I called this project, "Bamboo"> the pictures will speak for...

www.audiosciencereview.com

 

[james_o]

Hello all

Thanks for the quality thread, it motivated me to make one by myself.
This is my first time DIYing an amp so can someone confirm my understanding is correct?

I'll use meanwell LRS-350-48 and 260-2-29A.
Is the above all I have to do? I know nothing about the board's J5 region, but will be satisfied if it works properly whatsoever.

And if it's right, I noticed that meanwell smps has three pair of DC outputs.
Does that mean I can connect three 3e boards to one smps with no problems to consider?(In case I don't really need lots of power, maybe ~30W per channel)

This may be a very amatuer level question but just wanted to be sure, thanks!

 

[3eaudio]

@GNK this is right!

my understand is only one DC output with three pair terminal.

 

[james_o]

@GNK this is right!

my understand is only one DC output with three pair terminal.

So you mean I'll have to use 1 smps for 1 board?
Or I can just connect them as parellel?

ps. I already ordered one from aliexpress and waiting for it to be shipped. Hope to get it fast

 

[3eaudio]

you can parallel the board as you only need 30W per channel.
please note do keep cable as short as possible and twist them if you can

 

[james_o]

@3eaudio
Thanks! It was very helpful.

 

[antcollinet]

Hello all

Thanks for the quality thread, it motivated me to make one by myself.
This is my first time DIYing an amp so can someone confirm my understanding is correct?
View attachment 335600
I'll use meanwell LRS-350-48 and 260-2-29A.
Is the above all I have to do? I know nothing about the board's J5 region, but will be satisfied if it works properly whatsoever.

And if it's right, I noticed that meanwell smps has three pair of DC outputs.
Does that mean I can connect three 3e boards to one smps with no problems to consider?(In case I don't really need lots of power, maybe ~30W per channel)

This may be a very amatuer level question but just wanted to be sure, thanks!

You've only considered wiring between the components.

You also need to consider your connections for earth to the chassis - especially from a safety point of view.

 

[brunes]

In one of my previous posts, we talked about it with 3E Audio. This power supply will work out of the box with the module but it is of little interest.
Basically the SMPS630-SO PSU was designed for the XRK modules (TPA3255)

But I maintain, it has little interest here and what's more, it takes up a lot of space in a case)

View attachment 335443

Was considering the same, when I emailed them they said the +51V will work perfectly, even if its unregulated it may drop to 47V under 400W load.

It also has standby control port for ON/OFF and can run an LED powered switch
Could also power some speaker protection if you want.

It is quite big (need a big case) but I understand it can be repaired...

Sami, the owner also said he would give me advice to wire it.. had quite a few great emails from him.
Quality looks high.

 

[daniboun]

Was considering the same, when I emailed them they said the +51V will work perfectly, even if its unregulated it may drop to 47V under 400W load.

It also has standby control port for ON/OFF and can run an LED powered switch
Could also power some speaker protection if you want.

It is quite big (need a big case) but I understand it can be repaired...

Sami, the owner also said he would give me advice to wire it.. had quite a few great emails from him.
Quality looks high.

My SMPS630-SO PSU is on its way... My curiosity got the better of me)
I don't think I'll test it right away... But in my humble opinion, given that the 3E Audio module has a good PSRR, I don't expect miracles...
I've read quite a bit about this PSU and I already have a good idea of its performance. The Audio-Warp-1 amplifier is based on this PSU + XRK TPA3255 module.
It has been measured below and therefore it already gives a good idea....

Living Sounds Audio Discovery Warp-1 power amplifier Measurements

Sidebar 4: Measurements

www.stereophile.com

Besides, I would like to add that for an amp @ $1500, they could have at least twisted the cables

Micro Audio PSU VS Hypex PSU (We can imagine that it is well designed, both are unregulated)

Below is FFT of both power supply outputs with a 3W load.

 

[brunes]

Did you go with the +51V or reduce to the 46V?

 

[daniboun]

Did you go with the +51V or reduce to the 46V?

Got the 46V

 

[brunes]

Got the 46V

and.. what about a PCB board with capacitors, it was suggested that its not required for this board.

 

[daniboun]

and.. what about a PCB board with capacitors, it was suggested that its not required for this board.

The SMPS630-SO will work without the Power Supply Bus Pumping board. On the XRK PFFB amp, this additional module is not necessary, the same goes for the 3E Audio and for the Sylph Audio modules. Why, I don't really know because the user guide indicates that with certain Class D modules a pumping bus could occur....

I think that the designer of the Orchard Audio modules has a good knowledge of Micro Audio modules, I saw that he tested and measured some of them)

@orchardaudio > could you share your opinion about the Micro Audio PSUs ?
@xrk971 > the same for you, any feedbacks about these PSUs ?
@MicroAudio > Could you give us your opinion too

What interests me is to know on a practical and measurements level what an unregulated power supply could bring with this 3E Audio module.

 

[brunes]

And the best voltage option on the understanding lower can sound better.

 

[daniboun]

And the best voltage option on the understanding lower can sound better.

The best answer I can give would be that it will depend on the impedance of your speakers.
But generally speaking, even if it is not transcendent and as I have already said, the TPA3255 chipset has the best THD+N figure with a more moderate voltage.
But I advise anyone who would like to embark on this project to make the distinction between Mono and Stereo modules with regard to the choice of PSU as mentioned here

3E Audio 260-2-29A : TPA3255 / HA3588 CoilCraft / PFFB Fully differential.

That's not what "The G Word" says. The 'Pin 1 Problem' is explicitly about differential inputs and the problem created when manufacturers do the wrong thing with ground, removing the immunity from ground related noise that differential inputs ought to have. "The G Word" explains how this happens...

audiosciencereview.com