TPA3116 2.1 LPF sounds like a mess - diyAudio
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Old 27th January 2017, 07:55 PM   #1
Xappys is offline Xappys  United Kingdom
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Default TPA3116 2.1 LPF sounds like a mess

Hello,
I'm building cheapish 2.1 set for PC usage (2 satelittes and 6" sub). I have TPA3116 2.1 from ebay which I could use but the LPF is at horrible frequency!!! It's about 1Khz by my estimations. Is there any relatively easy way to modify it to something like 150Hz? I can write some values of components if needed ...
Any replies welcome

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Old 28th January 2017, 09:40 AM   #2
AndrewT is offline AndrewT  Scotland
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schematic please.
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regards Andrew T.
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Old 28th January 2017, 02:53 PM   #3
Xappys is offline Xappys  United Kingdom
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I'll try to find it in web ASAP.
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Old 28th January 2017, 05:30 PM   #4
Xappys is offline Xappys  United Kingdom
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I've spent many hours searching for schematics with no luck.
But well, I found an area which seems to be LPF stage. I hope it helps you to help me
Here are the values of numbered parts in photos: https://postimg.org/gallery/1lgq5dqea/
1. 47K
2. 33K
3. 33K
4. 47K
5.47K
6. 47K
7. unknown, tried measuring - numbers are slowly dropping and uneven.
8. 47K
9. 47K
10. 47K
11. 0.056uF
12. 0.056uF
13. NE5532
14. NE5532
15. measured - seems to be 33K
16. measured - seems to be 33K

Thank you !

Last edited by Xappys; 28th January 2017 at 05:32 PM. Reason: info fix
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Old 28th January 2017, 06:16 PM   #5
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7 is probably a 0.1uF capacitor.
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Old 28th January 2017, 06:33 PM   #6
Xappys is offline Xappys  United Kingdom
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I'm pretty new to filters and stuff, but isn't it two stage 24db/oct active LPF? If you could approve that, I might look for some formulas to calculate new resistors' and capacitors' values.
(Although it can't be that simple, can it?)

Thanks
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Old 28th January 2017, 06:46 PM   #7
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Without knowing the connectivity, it is hard to speculate.
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Old 28th January 2017, 06:50 PM   #8
Xappys is offline Xappys  United Kingdom
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Then I'm continuing my search for schematics. So many same type boards but no single schematic found yet ...
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