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Class D Switching Power Amplifiers and Power D/A conversion

TPA3116 + CSR8635 Idle Noise
TPA3116 + CSR8635 Idle Noise
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Old 1st August 2017, 10:59 AM   #1
baklazanowy is offline baklazanowy
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Unhappy TPA3116 + CSR8635 Idle Noise

Hello I've recently bought on Aliexpress class D amp TPA3116 + CSR8635. What is important to me it has potentiometer and 50W per channel. Nice feature is connecting DC with screws.

Annyway, I have an issue with noise, when bluetooth device is not connected. probably noise also exists when music is playing. But when music is being switched off - noise is very laud. Off course I could turn the potentiometer down - but it is not a acceptable solution here I used 24V 4.2A DC as power source. tested with one speaker connected.

I'm attaching photo of the board. Maybe someone will help me to solve noise issue ?
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Old 1st August 2017, 02:31 PM   #2
doctormord is offline doctormord  Germany
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Is th4 noise still present when connecting a cable to the line-in?
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Old 1st August 2017, 05:39 PM   #3
baklazanowy is offline baklazanowy
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Yes, I connected portable mp3 player via jack - nothing has changed.
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Old 1st August 2017, 05:43 PM   #4
baklazanowy is offline baklazanowy
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Quote:
Originally Posted by doctormord View Post
Is th4 noise still present when connecting a cable to the line-in?
Yes I've connected portable mp3 player via mini jack - nothing has changed.

Also when I connected short piece (without soldering) of wire to bluetooth antena - nothing changed as well
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Old 2nd August 2017, 09:30 PM   #5
doctormord is offline doctormord  Germany
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Can you try powering the board by batteries?
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Old 2nd August 2017, 09:39 PM   #6
baklazanowy is offline baklazanowy
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12V or 24V from batteries ? I'll try with batteries as power supply.
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Old 3rd August 2017, 12:53 AM   #7
doctormord is offline doctormord  Germany
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12V is fine.
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Old 19th September 2017, 08:57 AM   #8
baklazanowy is offline baklazanowy
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Hello, I tested this module with 12V battery as power source. Noise is still present just from the beginning. I've also tested different power sources - laptop's dc adapters - same result. The noise will be louder if I change gain with potentiometer.
There is any chance to fix this issue ?
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Old 19th September 2017, 02:06 PM   #9
theAnonymous1 is offline theAnonymous1  United States
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Quote:
Originally Posted by baklazanowy View Post
Hello, I tested this module with 12V battery as power source. Noise is still present just from the beginning. I've also tested different power sources - laptop's dc adapters - same result. The noise will be louder if I change gain with potentiometer.
There is any chance to fix this issue ?
Does the pot have writing on the back? Like "B50K" or similar?
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Old 19th September 2017, 02:08 PM   #10
baklazanowy is offline baklazanowy
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Quote:
Originally Posted by theAnonymous1 View Post
Does the pot have writing on the back? Like "B50K" or similar?
I have to de-solder it and check.
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