TPA3122 Groundings

Cyberzim · 05:45 PM

Hi there,
I just recieved some samples from TI with the TPA3122.
But after reading the schematic in datasheets, I got very confused.
What is the different between analog ground and power ground?
http://focus.ti.com/lit/ds/symlink/tpa3122d2.pdf

Thank you,

Simon H.A.

Cyberzim · 17th September 2009, 09:19 PM

I sovled the problem.
Power ground is the negative supply.
It works like a charm, with fairly sound even without filters and even with only a plug-in supply on 14volt it gives good output.

Simon H.A.

kkchunghk · 18th September 2009, 04:14 AM

Any chance to see some picture of the amp?

Cyberzim · 18th September 2009, 06:57 AM

Right now it's on a breadboard, and I need to buy some capacitors that have the correct capacity, but when I'm done with the amp and pcb, I will upload some pictures.

Regards,

Simon H.A.

kkchunghk · 18th September 2009, 09:06 AM

I'm also interested to see your beard board. You see, I have made a pcb skipping the beard board stage and it didn't work - oscillation. I'm going back to square one and start a beard board first. It would help me a lot to look at arrangements that work. You will do me a big favour.

m-tech · 10:06 AM

I don't now why you have so much problems with this amp. Schematic shows only few components.

This is my first prototype. It works great.

Cyberzim · 11:33 PM

Hi,
I have taken a photo of my breadboard. It might look very messed up, but that is because I have a big project on my breadboard, so I had little space to use.
Also I have read the output with a oscilloscope, when playing music so you can see how the output is.
I also have added a LC filter, but the inductor is homemade so I don't know the value on it, but the sound is very good now, and the bass is more smooth and clear.

Regards,

Simon H.A.

17th September 2009, 05:36 PM	#1
Cyberzim diyAudio Member Join Date: Apr 2009	TPA3122 Groundings Hi there, I just recieved some samples from TI with the TPA3122. But after reading the schematic in datasheets, I got very confused. What is the different between analog ground and power ground? http://focus.ti.com/lit/ds/symlink/tpa3122d2.pdf Thank you, Simon H.A. Last edited by Cyberzim; 17th September 2009 at 05:45 PM. Reason: Forgot datasheets

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17th September 2009, 09:19 PM	#2
Cyberzim diyAudio Member Join Date: Apr 2009	I sovled the problem. Power ground is the negative supply. It works like a charm, with fairly sound even without filters and even with only a plug-in supply on 14volt it gives good output. Simon H.A.

18th September 2009, 04:14 AM	#3
kkchunghk diyAudio Member Join Date: Oct 2004	Any chance to see some picture of the amp?

18th September 2009, 06:57 AM	#4
Cyberzim diyAudio Member Join Date: Apr 2009	Right now it's on a breadboard, and I need to buy some capacitors that have the correct capacity, but when I'm done with the amp and pcb, I will upload some pictures. Regards, Simon H.A.

18th September 2009, 09:06 AM	#5
kkchunghk diyAudio Member Join Date: Oct 2004	I'm also interested to see your beard board. You see, I have made a pcb skipping the beard board stage and it didn't work - oscillation. I'm going back to square one and start a beard board first. It would help me a lot to look at arrangements that work. You will do me a big favour.