New Dual TPA3255 Module + PFFB / Fully differential / OP amps DIP8 @ Great price

[daniboun]

Hi amigos,

As usual, I'm sharing my little discoveries from the web. I made a good find, so I'm sharing it.
I found a TPA3255 dual chip module with PFFB and DIP8 op amps at a pretty good price!

SPEC :
Dual Chip TPA3255 (PBTL)
Version A : Fully Balanced
Version B : SE inputs
Power : 150W / 8R -- 300W/ 4R -- 600W/2R
PFFB
PCB : 100mmx83mmx35mm (including Heatsink)
OP Amps DIP8 (upgradable)
PSU max 53.5V (single rail)

Link to Module

 

[1066]

Would be good to see it measured.

150w/8 300w/4 and 600w/2 ohm. Can it actually produce this?

 

[MCH]

If it comes with the heat sink, it is a decent price

 

[ai1]

M-m-m, would not be that sure. There are exactly the same boards by other vendors available (at a slightly better price, if you take shipping into account) which do not mention PFFB, cf this link Go figure... And for essentially the same price you get this one with the case etc.

 

[Hiten]

And for essentially the same price you get this one with the case etc.

It is probably without power adapter. Douk A5 is tested here. Little more than 30 watts into 8 ohms load.
LM3886 or TDA729x Series (class ab) can easily get this much power with comparatively lower distortion and no load dependancy.

 

[daniboun]

M-m-m, would not be that sure. There are exactly the same boards by other vendors available (at a slightly better price, if you take shipping into account) which do not mention PFFB, cf this link Go figure... And for essentially the same price you get this one with the case etc.

I saw it mentioned on other links without any specific mention, but they don't actually state that PFFB is absent... I'll try asking several Chinese sellers to get a better idea anyway.

 

[daniboun]

150w/8 300w/4 and 600w/2 ohm. Can it actually produce this?

I don't think so, but if we draw an analogy with the Topping PA7 which uses two TPA3255 chips with a 53V/6.5A PSU, I imagine we should be able to approach 145W/4R and 105W/8R

 

[MCH]

M-m-m, would not be that sure. There are exactly the same boards by other vendors available (at a slightly better price, if you take shipping into account) which do not mention PFFB, cf this link Go figure... And for essentially the same price you get this one with the case etc.

I bought the A5 during sales for even less, it is probably the best value of this class right now. This board has two chips though, it should be able to provide double the current, so not an easy comparison.

 

[daniboun]

I received confirmation from three different vendors; they all confirmed that the module has a PFFB implementation

 

[daniboun]

Found a picture from a user who bought it

NB :

 

[frabor]

I don't think so, but if we draw an analogy with the Topping PA7 which uses two TPA3255 chips with a 53V/6.5A PSU, I imagine we should be able to approach 145W/4R and 105W/8R

Unless you add some cooling, I don't think that you can get 150 Wpc.

 

[Tell]

Looks like a nice one! Would love to see some measurements of this one. Anyone care to do a build and send to Amir?

 

[TurtlePaul]

Unless you add some cooling, I don't think that you can get 150 Wpc.

That aluminum block is more than sufficient cooling for this. I would be willing to bet it does 150 wpc with a 48V/10A power brick.

 

[frabor]

That aluminum block is more than sufficient cooling for this. I would be willing to bet it does 150 wpc with a 48V/10A power brick.

90% Efficient Class-D Operation (4 Ω), according to the datasheet, so at 150 Wpc, about 30W of heat. Laptops with a similar power load require a cooling fan. Seems possible but borderline.

Dual Tpa3255 in pbtl, with proper cooling can do close 250 Wpc with a 48V/ 10 A

 

[popej]

Version A : Fully Balanced

Isn't that enough opamps? It is probably dual unbalanced in bridge mode. The difference is, that common mode signal is not dumped at input but amplified and present at speaker outputs.

Edit: but maybe it could be done. Opamps should work in differential mode with with first order low pass.

 

[daniboun]

Isn't that enough opamps? It is probably dual unbalanced in bridge mode. The difference is, that common mode signal is not dumped at input but amplified and present at speaker outputs.

Edit: but maybe it could be done. Opamps should work in differential mode with with first order low pass.

PBTL dual-chip balanced. Works in the same way as the Topping PA7 )

 

[UA8890]

This module is currently on sale on AliExpress. With the discounts applied, it costs just $47–48. It is available in two versions: one with a balanced input and one with an unbalanced input. The board also features an auxiliary ±12V output voltage for connecting a preamplifier. The price is the same for both versions.

 

[UA8890]

And this is the balance board. It has four connectors.

 

[somebodyelse]

PBTL dual-chip balanced. Works in the same way as the Topping PA7 )

I don't know whether anyone's checked on the PA7, but the B100's 'balanced' implementation drives one half of the bridge from the hot and the other half from the cold, rather than doing it properly with a differential input that then drives both halves in antiphase. That means it won't work properly with 'impedance balanced' outputs like the one presented in 'The G Word' or with RCA to XLR twisted pair cables. Schiit do this with the Vidar's bridged mode, but at least they include a note about it in the manual. I think it's been found in some of the TPA325x amps too but I don't remember which models.

 

[daniboun]

I don't know whether anyone's checked on the PA7, but the B100's 'balanced' implementation drives one half of the bridge from the hot and the other half from the cold, rather than doing it properly with a differential input that then drives both halves in antiphase. That means it won't work properly with 'impedance balanced' outputs like the one presented in 'The G Word' or with RCA to XLR twisted pair cables. Schiit do this with the Vidar's bridged mode, but at least they include a note about it in the manual. I think it's been found in some of the TPA325x amps too but I don't remember which models.

With this TPA3255 module, there's no need to ask the question, since there are two versions: one fully balanced and the other in SE mode )