TPA3116D2 Amp

[Blue5]

Hi all, got my TPA3116 Yuan-Jing blue/black board today. I'm planing to do all mods described in wiki except maybe inductors not sure how difficult is it to remove existing ones without damaging the board.
I have following questions if someone would like to answer or point me in a right direction:
1. Wiki says that 50K ohm pot is recommended, are other values like 10 and 20 K also OK?
2. What is the reason for two different sizes of input signal caps? Wiki is recommending Panasonic caps, I presume that all four need to be replaced?

Thanks and Regards

 

[irribeo]

Wiki is incorrect in several things, potvalues you mention are better.

 

[theaspin]

I've done some tests with both inductors and ferrite beads on other TI amps and frequency response is nearly the same. The biggest advantages of ferrites are price and space.

 

[lutkeveld]

and idle current

 

[hifix]

Thanks for that theaspin & lutkeveld.

 

[amozonesk]

buzzing subwoofer

Hi guys,

I've ordered a TPA3116D2 amp from som chinese ebay user, it arrived today and I immediately hooked up some speakers to it. However, the subwoofer produces a very annoying buzz sound, while the 2 other speakers don't. Also, if I try to connect one of the other speakers to the subwoofer output, it's also buzzing. I'm powering it with 12V PC power supply and I've also tried one 15V cambridge audio power supply which is generating even more buzzing. Do you have any idea what could cause this problem? The amplifier is not in any casing yet.

Knobs from left to right - volume control, sub freq, sub volume

Also I've noticed that the knob stated as "sub volume" is also controlling the output of the other 2 speakers, not only the subwoofer. Could this be it?

Thanks

 

[hifix]

At the "guess".... The input to the subwoofer might not be connected properly. In the case of the YJ blue / black board, when the input is disconnected, it buzzes.

 

[amozonesk]

At the "guess".... The input to the subwoofer might not be connected properly. In the case of the YJ blue / black board, when the input is disconnected, it buzzes.

Hi, thanks for the answer. What do you mean by "not connected properly"? It buzzes even when the input is connected. And it's a constant whistling sound.

 

[Poultrygeist]

You aren't the first to have issues with the 2.1 board.

 

[amozonesk]

You aren't the first to have issues with the 2.1 board.

Does that mean that there is no solution?

 

[hifix]

The signal may not getting to the chips input. At a "guess", you'd want to have signal continuity from the pins input jack (J5) to the input pins of the chip (subwoofer side).

 

[amozonesk]

The signal may not getting to the chips input. At a "guess", you'd want to have signal continuity from the pins input jack (J5) to the input pins of the chip (subwoofer side).

The signal si getting to the subwoofer, it's just accompanied with an annoyng buzz/whistle. And there is no chip on the subwoofer side, the signal goes straight to the speaker.

 

[Peter Georgescu]

TPA3116D2 mono / balanced

Hello guys,

a quick & dirty test run with my TPA3116D2 board sounds surprisingly good – especially with EDCOR input transformers which i use for balanced input:

So for now i'm running it stereo, but i have a second board and want to modify each of them to mono. This method surely is fine if you don't use inprut transformers:
Mod a TPA3116 amp for Mono Mode - Simple Media Networks, Inc

But with IT i guess it should be possible to connect / bridge the boards much easier. This thread is too massive to read it completely – so i would be extremely thankful for a hint 🙂

Best,
Peter

 

[irribeo]

You have a balanced source and you unbalance that signal for the tpa3116 ?

 

[Peter Georgescu]

You have a balanced source and you unbalance that signal for the tpa3116 ?

Exactly. The idea is to use the TPA3116D2 mono & balanced....just don't know how to do it the smartest way.

 

[irribeo]

Follow mod you linked but use the two big blue capacitors both on left side, one is + other is - input from your source. Rightside capacitor solderpads closest to chip need to be connected directly to gnd, without capacitors.

 

[Peter Georgescu]

Follow mod you linked but use the two big blue capacitors both on left side, one is + other is - input from your source. Rightside capacitor solderpads closest to chip need to be connected directly to gnd, without capacitors.

OK, thanks for that! Output terminals connected as in the linked mod?

 

[irribeo]

Yes, exactly as writen on that page, only difference: on that page they take a new MKT (pet) capacitor for negative input to sit beside the MKP (pp) X2 capacitor for positive input, while the other side MKP isn't used anymore. I think it is better and cheaper🙂 to use better identical capacitors in both inputs🙂

The ampboards will have a balanced/differential input then and you could connect your source without additional transformer.

Others in this thread convert a single ended source to balanced with transformers and either connect to inputcapacitors or one step closer to chip, they skip the MKP's, for some transformers that would increase distortion and limit bandwidth a little

 

[Peter Georgescu]

...either connect to inputcapacitors or one step closer to chip, they skip the MKP's, for some transformers that would increase distortion and limit bandwidth a little

Hi,

that was my initial thought too, since the Edcor transformers are pretty good. I considered connecting the incoming balanced + and - to the positive right and left inputs and use the positive R/L outputs as mono +/-

But: what to do with the input ground and the negative R/L outputs? Shorting the negative outputs and connecting the input ground to chassis ground?

Best,
Peter

 

[irribeo]

tpa3116 is already bridged