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Has anyone tried this TPA3116D2 X2 board from China?
Has anyone tried this TPA3116D2 X2 board from China?
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Old 12th October 2021, 12:15 AM   #1
whaleman is offline whaleman  United States
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Default Has anyone tried this TPA3116D2 X2 board from China?

I had a free project chassis so I got this cheap TPA3116D2 board on eBay from China. I was surprised at how well it was put together, and its sounds is not bad. I need advice on upgrading the output filters. It has quite a bit of hiss. As usual, my intent is to take it to the next level. To be candid, for $32, there is hardly anything complain about.
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Old 12th October 2021, 12:23 AM   #2
weissi is offline weissi  Europe
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The hiss is definitly coming from the onboard preamp (4x opamp so14), combined with a to high gain from the tpa3116. I'd first lower the gain on the TPAs.
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Old 12th October 2021, 02:24 PM   #3
whaleman is offline whaleman  United States
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Gain is set to max on the 3116D2, that is 36dB, I can set it to 20 dB. Since these are SMD resistors, 20dB is about the only option I have, there are two other steps in between, but I do not have the resistors for those. Both chips are set to master mode.

Thanks.
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Old 13th October 2021, 03:07 AM   #4
whaleman is offline whaleman  United States
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Quote:
Originally Posted by weissi View Post
The hiss is definitly coming from the onboard preamp (4x opamp so14), combined with a to high gain from the tpa3116. I'd first lower the gain on the TPAs.
Thank weissi, you are a genius and knew exactly the solution. I followed the TI datasheet and brought the gain down to 20dB from 36 dB. So quiet at turn on, that I wondered if amp was no longer working. It is dead quiet now, no hiss, not even a hint of it. And turn on/off pops almost acceptable. I had to wire in the R39 (R1) 5.6K resistors as no SMD tools or resistors available here at my bench. R37 (R2) is left open (removed). Input cap already at 1 uF.
The sound is very hi-fi now.

Next task is to mute board before on/off. Have to obtain a switch first. There is no trace on the pins 2, so it will be a bit of challenge to solder the small wires for the switch between SDZ (2) and GND (9), I think...
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Last edited by whaleman; 13th October 2021 at 03:18 AM.
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Old 13th October 2021, 06:21 AM   #5
Khron is offline Khron  Finland
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The chip doesn't necessarily DEMAND the exact 5.6kohm resistor value there; at least on the small PBTL mono boards, the 20dB setting is achieved simply by removing the top resistor from that resistive divider.

Also, very interesting that they included four boost-converter (XL6019) chips on board. I guess that's how they achieve the "car amp" status, without lying. Kinda wonder what the beat frequencies might be, between them.
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Old 2nd December 2021, 01:30 PM   #6
Whoops is offline Whoops  Portugal
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How many amps does the PSU needs for that module?


thanks
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Old Yesterday, 03:55 AM   #7
phase is offline phase  United States
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19V, over 10A.

For less $ you can get one with Bluetooth 5.0, no hiss.
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Old Yesterday, 12:48 PM   #8
ilcaccillo is offline ilcaccillo
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10A ??????

It canít be, thatís too much
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Old Today, 03:52 AM   #9
phase is offline phase  United States
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Well you can use 2 amps, just donít expect to get what the amp is capable of.

Also keep in mind some de-rating of a power supply is always a good idea.

Each TPA3116 will take up to 7.5A before the protection kicks in.
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