TPA3255 - all about DIY, Discussion, Design etc

[bucks bunny]

not really. As long as there is no input signal present nothing will happen at the output, normally. And if the output is loaded with a real speaker - this will NOT dampen the LC-output filter resonance, as its impedance is far away from 4 or 8 Ohms at 50kHz, i.e. the resonant frequency.

 

[Pygmy]

No..any class d needs its outputs connected. Use a 4 to 8 ohm power resistor if not

Also if that channel will never be used?
If it just means that channel will be fried, but doesn't influence the performance of the other channels, that would be fine
This is just out of curiosity though, I'm pretty much convinced by now to buy a 2-channel board and a single channel board from 3E audio, together with their DSP board.

The only thing keeping me from that is I'm still wrapping my head around the whole "connect the boards, configure one as slave" thing.
I'm not sure whether it's necessary for me (making a 3-way speaker), if it is it might be troublesome as the docs state I'd have to solder some surface mount resistor and I'm not comfortable with doing surface mount stuff...

 

[turion64]

I see 3e have updated their 3255 2 channel. Now has rollable opamps....through hole electrolytics and fast on connections

Yup, I ordered the new version. I hope it sounds better than the older version (which was good but not sonically satisfying). Being able to roll op-amps may make more adjustable to different stereo system setups. We’ll see.

 

[daniboun]

Hi amigos,

About the new 3E Audio TPA3255, revision EAUMT-0260-2-A...
I dont see any removable OP amps. Seems the new version is shipped with some JRC 4580 Op amps.

http://www.3e-audio.com/wp-content/uploads/2018/07/DS_EAUMT-0260-2-A_Rev1.0.pdf

 

[turion64]

You have to look at his Ebay posting. He hasn't updated his website yet it seems.



Cheers

 

[daniboun]

Thanks,

Seems their site is not up to date indeed )

 

[turion64]

He's included beefier caps as well, 2200uF i think. Still only 63V (I think) so driving board at 48-50v kinda living life on the edge, but not too badly. The board would have had to gotten bigger for higher voltage caps.

 

[quadtech]

So my 3E Audio TPA3255 board and Meanwell LRS-350-48 power supply temporary set up is now 2 years old, I think it is about time for a permanent enclosure!! I want to put both in a metal enclosure but have a few queries for those who have done this before.

1. Can I switch the 240V AC on and off with a DPDT switch on the front panel and have the Meanwell completely off when not in use or is it better to switch the DC output?

2. Would a soft start circuit like this Softstart Module 230V 15A for Amplifiers - Audiophonics be of any use?

3. I understand the Meanwells are well protected, would I need a fuse on the AC side?

1. Yes - DPDT switch on the mains is fine
2. You don't really need a soft start
3. It dosen't hurt to have an extra bit of safety

 

[saran008]

Thanks,

Seems their site is not up to date indeed )

Is the new 3e TPA3255 2 channel, REV B has the PFFB included?
anybody can verify?

 

[turion64]

I don't believe it has PFFB installed but the instructions are there to do it yourself (if you're capable). I asked if PFFB is going to be am orderable option and was told no

 

[drMordor]

I asked if PFFB is going to be am orderable option and was told no

Who said that?
PFFB improves amplifier performance.

 

[saran008]

Thanks,

Seems their site is not up to date indeed )

Doc,
i think, that's reply from 3e.
means the REV B also not PFFB equipped and also cannot order as option also.

so theoretically, REV B seems, roll able opamps & electrolytic caps only

 

[saran008]

BRZHIFI has also released a new version of TPA3255 with 4X OPA AD827JN

Tpa3255 amplificateur de puissance 300W * 2 Bluetooth 5.0 amplificateur de puissance numerique mieux que tpa3116d2 | AliExpress

Dani,
After your short review am closely watching the developments in that BRZHiFi amp.
Also they changed
1. toggle switch to push button
2. the caps from electrolytic to SMD type

Does this amp has anti-pop?
How's the volume level when compared to Aiyima A04. (when the tone control is OFF/ON)?

 

[daniboun]

The PFFB modification for 3E Audio is available here :

http://www.3e-audio.com/wp-content/...ification-on-EAUMT-Serise-Amplifier-Board.pdf

 

[saran008]

The PFFB modification for 3E Audio is available here :

http://www.3e-audio.com/wp-content/...ification-on-EAUMT-Serise-Amplifier-Board.pdf

Dani,

yes. but for people like me not so comfortable to solder SMD components, off the shelf will be better option.
as they already changed revision, would have added this also :facepalm:

 

[daniboun]

Dani,
After your short review am closely watching the developments in that BRZHiFi amp.
Also they changed
1. toggle switch to push button
2. the caps from electrolytic to SMD type

Does this amp has anti-pop?
How's the volume level when compared to Aiyima A04. (when the tone control is OFF/ON)?

BRZhifi TPA3255 has an anti pop circuit yes ) and absolutely dead silence.
In fact it uses 4 OP amps, 2 are dedicated to Tone Control and 2 for the amp itself. When rolling 4 OPA1656, I really got a great improvement. (I thing the stock ones are fake)
As said in my review, I wonder why they put a 38V PSU instead a 48V one...

Compared to the Aiyima A04 it is pretty close when rolling the new OP amps.

 

[saran008]

BRZhifi TPA3255 has an anti pop circuit yes ) and absolutely dead silence.
In fact it uses 4 OP amps, 2 are dedicated to Tone Control and 2 for the amp itself. When rolling 4 OPA1656, I really got a great improvement. (I thing the stock ones are fake)
As said in my review, I wonder why they put a 38V PSU instead a 48V one...

Compared to the Aiyima A04 it is pretty close when rolling the new OP amps.

Thanks for the update.
My Aiyima A04 volume level is low, when compared to FX502s PRO, when the POT knob is at same position.

Not sure my unit problem or it's like that.

that's why asking

 

[daniboun]

I personnaly control my volume via ma double AK4497 dac + LG V30 device
So I don't really care about the Volume knob... it is set @ 12:00

The Aiyima A04 drives my 8 Ohms high end floor speakers @ 100W RMS / 93DB + Ribbon tweeter without any problem )

 

[saran008]

Thanks Dani for the clarification.
What am asking is, say ur TPA3255 brzhifi & TPA3251 A04 set at same 12:00, same volume at DAC & V30, which is louder?

 

[daniboun]

At 12:00 Brzhifi and Aiyima A04 are pretty the same...
In my previous reviews I already talked about this fact : Chinese TPA3251 vs TPA3255 are very similar in terms of factual power...Theoretically, this shouldn't be the case!

High quality TPA32XX; manufactured in the rules of art, are really more powerful and clearly stand out compared to Chinese productions.
I own many Class D amps and many TPA32XX amps. My high end TPA3251 delivers at least 30% more volume power compared to Aiyima A04. The quality of the components and the PFFB bring a lot (I mean each component : bufffer caps, output filters, Main caps, Inductors, PFFB implementation, PSU quality etc)

This top end TPA 3251 holds the comparison with my Double Mono Hypex Ncore for example.