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Class D Switching Power Amplifiers and Power D/A conversion

TPA3116 2.1 Channel BT - Sound cutting every 1s @ low input (video)
TPA3116 2.1 Channel BT - Sound cutting every 1s @ low input (video)
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Old 25th September 2018, 06:52 AM   #11
FauxFrench is offline FauxFrench  France
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Location: The mountains, calm and quiet.
Quote:
Originally Posted by eljoantonyn View Post
OFFTOPIC:
I have the exact amp board (bought from the Aiyima storefront at Aliexpress) and noticed the capacitors at the power supply side are low voltage (only 36V). Is that OK ?
The voltage rating of 36V (35V is normal standard) is fine. TPA3116 can handle 26V maximum.
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Old 25th September 2018, 07:40 AM   #12
eljoantonyn is offline eljoantonyn  India
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Quote:
Originally Posted by FauxFrench View Post
The voltage rating of 36V (35V is normal standard) is fine. TPA3116 can handle 26V maximum.
Ok, thanks for the reply.
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Old 25th September 2018, 11:35 PM   #13
Think is offline Think  Netherlands
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TPA3116 2.1 Channel BT - Sound cutting every 1s @ low input (video)
Quote:
Originally Posted by overdose View Post
thanks for the advice.

Yeah, I use it for 3 months in my diy box, and it was ok.

Suddenly, volume @ 15%, the sound start clicking like so : YouTube

I did some test on many speaker, and figured out that the right channel was clicking hard (DC to speaker), left channel was turning the sound off, and subwoofer still running.

5 first minutes @15%, the sound is ok. After the 5 minutes or so I need to put volume @50-60% to avoid cut-off. And 50% on those amp is loud.
I was under the impression it never worked correctly, so something on the board is probably damaged; as it functioned OK before.

Last edited by Think; 25th September 2018 at 11:38 PM.
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Old 27th September 2018, 03:24 PM   #14
overdose is offline overdose
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Join Date: Sep 2018
fauxfrench put me on a good track.

Those amps are shipped in a bubble wrap, poorly protected.

One capacitor might be in fact damaged.

Quote:
Originally Posted by FauxFrench View Post
I watched your video. I only see one speaker. Is that the left channel repeatedly turning off the sound? If yes, there is also a right channel (with DC failure) we don't see and a sub-channel we don't see?.

DC at the output could be caused by a leaking coupling capacitor at the TPA3116 input (right channel). When the right channel puts DC on the speaker, it does not take long before the safety-circuit shuts down the whole chip and after about a second, attempts a "hick-up" re-start which turns the left channel on for a short moment.
Perhaps the key to the problem is the right channel that only does "clicking" (no music), correct?
you wont see anything with those small cheap speaker. Its noticable on the 12''

- right click and stop music
- left only stop music
- sub still running fine

the ''sub'' 6.5'' is on the back .

See the inside, with a new smaller chip. Sound is better with this chip, but 50wx2 isnt very loud...

Click the image to open in full size.

Click the image to open in full size.

Last edited by overdose; 27th September 2018 at 03:36 PM.
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Old 27th September 2018, 09:01 PM   #15
FauxFrench is offline FauxFrench  France
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Join Date: Dec 2017
Location: The mountains, calm and quiet.
Thanks for the photos.
Try to start the system with music as usual and with a voltmeter (DC range) across the right speaker terminals. For a start the voltmeter is likely to flicker somewhat from the AC music but without a clear DC component. After a while, you will probably see a DC value grow until you have the clicking in the speaker. Then switch off.
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