TPA3255 - all about DIY, Discussion, Design etc

Jump to Latest
#4,167
Do you have another PS you can run the amp with then test DC offset again? I'm making the assumption that you have a single SMPS (providing "+" and "Gnd (return)" voltage connections to a single amp board (dual channel)?

Photobuggs said:
The issue exists even if the source is not connected. What could be the issue and is there any solution which I can try. Thank you all for your suggestions. Now I learned how to check DC offset on amplifiers.
Click to expand...
 
#4,170
Photobuggs said:
[emoji23] any suggestions if I can rectify the dc offset other than sending the amp back to China.
Click to expand...

The DC offset cannot come from the source because the inputs of TPA3255 has series input coupling caps. So check for the input caps themselves, they might be shot already so they cannot block DC anymore (coming from 1/2 opamp supply), change the broken input channel with 4.7uF polypropylene or 10uF electro caps..

Also check for the output filter (inductor + cap).

BTL imbalance (DC offset) trigger of TPA3255 is 1.5A, so if you are using 4ohms speakers, the DC protection of TPA3255 should trigger.
 
#4,172

Attachments

  • JLE SYLPH-D200 power vs frequency vs distortion into 4 ohm Measurements TPA3255 STEREO amplifi...png
    JLE SYLPH-D200 power vs frequency vs distortion into 4 ohm Measurements TPA3255 STEREO amplifi...png
    21.7 KB · Views: 648
#4,173
"I am happy to recommend the JLE Sylph-D200 amplifier module" of the panther.

Hello
Well done, great achievement.
I had no doubts about the "I am happy to recommend the JLE Sylph-D200 amplifier module" of the panther.

My V1, has been on trial since November (about 16 hours per day) and I am currently putting it in a box.
I partition the different modules as much as possible, it is a lot of machining.
I chose to deport the input and TPA input capacitors.
I use big Wima mkp10.

Another big thumbs up!

Best regards
Roger
 
#4,174
Good Job Jlester )
Your module works great for me.

I am pretty surprised about the power @ 8 ohms / 35W for both channels.
It remains light but sufficient for listening in a non-oversized room

So you can compare :

The A07 TPA3255 @48V / 3A will provide you 61W / 8R
VS @32V / 5A = 48W / 8R
 
Last edited:
#4,175
bobo le chat said:
Hello
Well done, great achievement.
I had no doubts about the "I am happy to recommend the JLE Sylph-D200 amplifier module" of the panther.

My V1, has been on trial since November (about 16 hours per day) and I am currently putting it in a box.
I partition the different modules as much as possible, it is a lot of machining.
I chose to deport the input and TPA input capacitors.
I use big Wima mkp10.

Another big thumbs up!

Best regards
Roger
Click to expand...

Thanks Roger!
 
#4,177
daniboun said:
Good Job Jlester )
Your module works great for me.

I am pretty surprised about the power @ 8 ohms / 35W for both channels.
It remains light but sufficient for listening in a non-oversized room

So you can compare :

The A07 TPA3255 @48V / 3A will provide you 61W / 8R
VS @32V / 5A = 48W / 8R
Click to expand...

Hi Daniel,

We identified that the early clipping was due to overloading of the input of PFFB.

Since your amp has unity gain buffers, it should get the appropriate power output. You can check by measuring voltage before clipping light indicator lights up.

Regards,
Lester
 
You must log in or register to reply here.
Top Bottom