Which TPA3255 amp do you recommend?

[robertospeed]

Your TPA3255 amplifier is the same as the one I used to use before, without the circuitry to prevent pop noise when powering on and off.
The model that improved it is AIYIMA A07. Since this model has a built-in anti-pop circuit, there is no noise at all.

OK then I buy the AIYIMA A07, but on amazon and on ebay I can't find it, I'm Italian, I have to buy it on Aliexpress.
It feels really good with the 726 focal chorus, for now I'm using a 36v 5a power supply, you have to get me the 48v 7.3a.

 

[Toku]

OK then I buy the AIYIMA A07, but on amazon and on ebay I can't find it, I'm Italian, I have to buy it on Aliexpress.
It feels really good with the 726 focal chorus, for now I'm using a 36v 5a power supply, you have to get me the 48v 7.3a.

A 36V/5A power supply is sufficient for the TPA3255 amplifier. .. I am using a 48V 3.3A power supply with the voltage reduced to 41V. The voltage of 48V causes severe heat generation.

 

[Xulonn]

for now I'm using a 36v 5a power supply, you have to get me the 48v 7.3a.

I don't really see the value in pushing cheap Chinese mini-amps to the limit by using maximum allowed voltages. You might get 2db more output from your speakers, but that is insignificant.

I use a 24v PS with my I.AM.D v200, but it is rated for up to 35v. I also noticed that most sellers include or recommend a 24v PS.

OTOH, "hot-rodding" cars, motorcycles, computers, and electronics is something many guys enjoy doing.

 

[Toku]

I.AM.D V200 uses 1800uF/35V for the electrolytic capacitor of the power line. If you are a little familiar with electronic circuits, you can easily imagine that connecting this amplifier to a 35V power supply will damage the electrolytic capacitor or shorten its life.
To safely use the I.AM.D V200, the power supply voltage should be reduced to about 24V, or at most 32V or less.

 

[nrabbit]

I don't really see the value in pushing cheap ChiFi mini-amps to the limit by using maximum allowed voltages. You might get 2db more output from your speakers, but that is insignificant.

I use a 24v PS with my I.AM.D v200, but it is rated for up to 35v. I also noticed that most sellers include or recommend a 24v PS.

OTOH, "hot-rodding" cars, motorcycles, computers, and electronics is something many guys enjoy doing.

Higher voltage also improves THD+N on the TPA3255. TI suggests running it as high as 53.5v if you have >=6 ohm speakers.. although as you pointed out most of the cheap caps on these amps won't allow this.

ref page 10
https://www.ti.com/lit/ds/symlink/tpa3255.pdf?ts=1597881502646

 

[nrabbit]

I'm running mine at 53.5 for my elac DBR 62s. They certainly like the extra juice. Obviously takes some rather giant 63v nichicon caps.

(don't mind the cardboard.. it's just there to provide some ventilation.. only runs vaguely warm to the touch!)

 

[Toku]

I'm running mine at 53.5 for my elac DBR 62s. They certainly like the extra juice. Obviously takes some rather giant 63v nichicon caps.

(don't mind the cardboard.. it's just there to provide some ventilation.. only runs vaguely warm to the touch!)

I don't know any TPA3255 amplifier on the market that can be used at 53.5V except TI EVM module.
I also own some TPA3255 amplifier boards from 3e audio. This product allows use with voltages up to 51.5V, but in practice 48V is the limit.
What kind of amplifier do you use?

 

[nrabbit]

Some members of the diyaudio forum made a tpa3255 based off the TI EVM to optimize noise and THD performance. I missed out on the group buy for a pre-assembled board so I bought a PCB and hand soldered it. This is a upgraded version of the board that maty posted in post #7 (now includes post filter feedback). It actually beat the TI spec at 0.0011%THD vs the TI specified 0.0021%THD with PFFB enabled
https://www.diyaudio.com/forums/group-buys/340880-tpa3255-reference-design-class-amp-gb.html

 

[lukyjohnson]

Then, I would prefer the TPA3255EVM from TI (unfortunately also the most expensive. Was there something about 50% reduction?). It has a balanced input - therefore, no less well-designed input balancing amplifier is implemented. But, you need a pre-amplifier with a balanced output.

The E-bay amplifier uses JRC4580 OP-AMPs but else it seems more similar to the "blue board" with SMD input and output signal coupling capacitors. The supply voltage to the OP-AMPs I cannot see. Also balanced inputs, but with buffer amplifiers. Can perhaps be reconfigured to a single signal line with jumpers? Good heatsink and good output filter chokes.

 

[carlmart]

OK, which is the best I can get on eBay or Aliexpress on a ready made TPA2155, with case and all, and which PSU to buy for it?

Or the PSUs are coming inside the amp case? Staying below 48v seems like a good advice for all.

 

[Toku]

Some members of the diyaudio forum made a tpa3255 based off the TI EVM to optimize noise and THD performance. I missed out on the group buy for a pre-assembled board so I bought a PCB and hand soldered it. This is a upgraded version of the board that maty posted in post #7 (now includes post filter feedback). It actually beat the TI spec at 0.0011%THD vs the TI specified 0.0021%THD with PFFB enabled
https://www.diyaudio.com/forums/group-buys/340880-tpa3255-reference-design-class-amp-gb.html

I am very interested in this amp. However, the finished amp board is not sold.
It is very difficult to collect the parts that match the PC board one by one.

 

[chips666]

I am very interested in this amp. However, the finished amp board is not sold.
It is very difficult to collect the parts that match the PC board one by one.

https://www.diyaudio.com/forums/group-buys/358646-xrk-rtr-tpa3255-reference-class-amp-gb2.html

Yes you can buy a complete and tested board once there are 20 buyers in this second group buy
I am very interested too
Enjoy...

 

[carlmart]

A little detail: a $277 price tag for the amp. A little too much, isn't it?

Aren't there better options?

 

[chips666]

http://www.360customs.de/en/tag/tpa3255/
If you mean as good as yes but diy
If you mean cheaper Yes alot
Enjoy..

 

[nrabbit]

A little detail: a $277 price tag for the amp. A little too much, isn't it?

Aren't there better options?

If you're looking for cheaper options there are tons scattered throughout this thread. As far as "better" I don't think anything under $1000 comes near this as far as THD performance. The 3e TPA3255 amp is great if you're looking for a bargain ($60) that still measures somewhat well (.01%THD).. and they have the Audio Precision measurements to back it up.

 

[Bruce Morgen]

FWIW, I ordered two Aiyima A07s that arrived recently -- after 82 days in transit. The one I'm using is flawless -- no popping at all and astonishing performance for the price. I'm running it at about 50VDC @10A via a generic Chinese SMPS with an additional 1000uF filter cap in shunt. I haven't cracked it open to check the cap ratings, but the mfr. recommends 48VDC which leads me to guess they're 63V or perhaps even 80V parts -- none of my previous Chinese chip amps had underrated filter caps, so I'm pretty confident this thing will hold up just fine, although I'm not planning to push it to the optimum 53.5VDC.

 

[nrabbit]

Looks like Aiyima uses a 50v 1000uF nichicon cap so you are right at the limit

 

[carlmart]

Can't those caps be upgraded to something better and larger? Space is an issue, though.

 

[Bruce Morgen]

Looks like Aiyima uses a 50v 1000uF nichicon cap so you are right at the limit

Can't those caps be upgraded to something better and larger? Space is an issue, though.

There seems to be enough room along one side of the PCB for larger caps with long leads to be hooked up in the unlikely event whatever's in there ever fails. Hmm, what's the typical failure mode for a part like that -- do they tend to short out (extreme DC leakage) or just open up when they pop their tops?

 

[Bruce Morgen]

Looks like Aiyima uses a 50v 1000uF nichicon cap so you are right at the limit

Thanks for the photo. Is that the innards of the most recent version or the old one with the popping issue?