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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 26th September 2017, 01:35 PM   #21
theAnonymous1 is offline theAnonymous1  United States
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I'm thinking there's something wrong with the TPA3116 input components/layout. A 10k pot shouldn't have had much effect on the volume level.
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Old 6th October 2017, 12:16 AM   #22
baklazanowy is offline baklazanowy
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I took some hi-res photos:

Click the image to open in full size. Click the image to open in full size.
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Old 6th October 2017, 12:19 AM   #23
baklazanowy is offline baklazanowy
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@doctormord:
Could you point me where exactly should I solder 1500-2000 uF cap ?
25V or 35V of the cap?
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Old 6th October 2017, 08:51 AM   #24
doctormord is offline doctormord  Germany
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Seems like you only linked in the thumbnails?
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Old 6th October 2017, 09:07 AM   #25
baklazanowy is offline baklazanowy
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Strange...when I posted this reply, it works after click on thumbnails.

full res-photo:

front: http://www.mikomp.org/pcb/front.jpg
back: http://www.mikomp.org/pcb/back.jpg
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Old 6th October 2017, 04:31 PM   #26
doctormord is offline doctormord  Germany
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Best possible fix is like attached. Remove red marked components, solder wires in place like shown.

Drawback:
No volume control via potentiometer anymore
No Aux/Line-in (Aux might still work if they used the ADC of the BT-module.)

TPA3116 + CSR8635 Idle Noise-difffix_new-jpg

Keep the wires close together (R+/R- and L+/L-)
Attached Images
File Type: jpg DiffFix_New.jpg (266.4 KB, 68 views)
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Old 7th October 2017, 12:20 AM   #27
baklazanowy is offline baklazanowy
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Hello, many thanks for possible solution ! I will test it this weekend.
One question:

From point where (R+/R- and L+/L-) is marked I go directly to speakers +/- terminals (skipping connecting speakers cables to blue terminals on this board)

From what I understand I'm leaving after this solution option with adding capacitors.
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Old 7th October 2017, 08:24 PM   #28
doctormord is offline doctormord  Germany
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I dont understand your question.
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Old 7th October 2017, 09:19 PM   #29
baklazanowy is offline baklazanowy
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Where exacly should I connect speakers ? My guess: to colored dots near R+,R-,L+,L- ?
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Old 7th October 2017, 09:59 PM   #30
doctormord is offline doctormord  Germany
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To the output terminals as usual. The fix on the picture is to bypass the Linedriver between the bluetooth DAC output and TPA Input.
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