TPA3255 - all about DIY, Discussion, Design etc

[drMordor]

FDA based on TPA3255
Differential opamp THS4131 and differential inductors.

 

[IvanAltay]

I have not studied your circuitry in detail. Do you propose to first split the non-balanced signal into a balanced one, and then feed it to the TPA3255?
What for ?

 

[IvanAltay]

TPA3255 / TPA3116 were originally designed for balanced input. This is how it should be done. This is what the developer intended.

 

[drMordor]

No
All my amps have a balanced and SE input
Last amp, in photo have full differential structure.
And have balanced and SE input.

 

[IvanAltay]

DrMordor, understood - fell behind.

 

[IvanAltay]

DrMordor, I still dream of buying the RDC2-0034 All-in-One Epcos set, Class D power amplifier TPA3255 - 2600 RUB.
Can you offer your similar set (your board)? How much will it cost?

 

[drMordor]

I can do it

 

[IvanAltay]

ОК. You can voice the price tag in a personal.

 

[Mello4]

....Just found a new TPA3255, with balanced inputs and OP amps bypassed by default + EPCOS inductors. ...

I will try to order to test ).....

I would skip that board (RDC2-0034), the (15uH?) inductor does not seem optimum (odd choice). Most of the posts in the RDC2-0034 Russian forum thread seem to be from people that have very little understanding of circuits. It is an entertaining thread to read (using Chrome for translation).

TDK EPCOS: Sample kit: ERU chokes / series ERU 20 | TDK Electronics - TDK Europe

Datasheet EPCOS ERU 20, helically wound: https://www.tdk-electronics.tdk.com/inf/30/db/ind_2008/b82559_a020.pdf

 

[daniboun]

For a $30 module with balanced inputs and more or less good inductors ... I take the risk! How do you think success stories start? I've always been a risk taker in my life, I assume) 🙂 This could be a good starting point for DIYers.

 

[IvanAltay]

For a $30 module with balanced inputs and more or less good inductors ... I take the risk! How do you think success stories start? I've always been a risk taker in my life, I assume) 🙂 This could be a good starting point for DIYers.

Then sign off on the results. I also want such a module. The price tag rules.

 

[daniboun]

We can make the deal together ) I pay, you solder the best caps, you test, I test and then you ship it to me : 50/50 deal 🙂

 

[IvanAltay]

We can make the deal together ) I pay, you solder the best caps, you test, I test and then you ship it to me : 50/50 deal 🙂

Shipping from Russia to France will be expensive.
If I buy a device and try it out, I will unsubscribe based on the results.

 

[Mello4]

Another Russian forum on the above board.
?????? ??? ?????? ????????? ?? ?????? TPA3255

Hmmm....seems like cross pollination across forums....?????? ??? ?????? ????????? ?? ?????? TPA3255

 

[IvanAltay]

Mello4, our friend is also present there and criticizes the Russian board.

 

[IvanAltay]

For TPA3255 I ordered a CSR8675 receiver.

 

[IvanAltay]

https://aliexpress.ru/item/10050017...218729976.1608136311&sku_id=12000017512062696
Overview | Qualcomm CSR8675 SoC | Low-Power Audio Headset Chipset | Qualcomm
"Audio Recording
Sampling, Record: Up to 192kHz/24bit"

 

[Deleted member 148505]

I would stay away from modules with PVDD(tank) caps that are far away from the chip.
Guaranteed low performer.

 

[Deleted member 148505]

Thank you all for your suggestions and help.
DrMordor wants the board back and he will refund me.
Excellent service and super fair person!

Thank you Dr!!!

That module has 2-4 days work of a craftsman, logistics part excluded. It is painful to see the return.

 

[drMordor]

That module has 2-4 days work of a craftsman, logistics part excluded. It is painful to see the return.

I am sure that the amplifier is working, most likely Ilan's ears do not like class D amplifiers.