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Cheap TPA3118D2 boards, modding them and everything that comes with it
Cheap TPA3118D2 boards, modding them and everything that comes with it
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Old 30th September 2017, 06:24 PM   #2211
Kjeldsen is offline Kjeldsen  Denmark
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yes - probably somewhere. But, why didn't "they" just install it on the board? I have never experienced this before.

Should I just connect a resistor from signal to signal gnd? And, does it have any negative impact on sound?
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Old 1st October 2017, 02:12 AM   #2212
DUG is offline DUG  Canada
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Quote:
Originally Posted by Kjeldsen View Post
yes - probably somewhere. But, why didn't "they" just install it on the board? I have never experienced this before.

Should I just connect a resistor from signal to signal gnd? And, does it have any negative impact on sound?
The 50R is just for use with your phone.

Try higher values if used with another type of source.

You may have read (somewhere on here) that some pots have more noise at mid settings...because (IMHO) the impedance is lower at each end of the pot and allows more noise pickup in the higher impedance mid position.

Experiment.

You will have to tell us if there is any negative impact on the sound.
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Old 1st October 2017, 06:01 AM   #2213
Kjeldsen is offline Kjeldsen  Denmark
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You misunderstand. Its not my phone that's the troublemaker. It's the amplifier.
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Old 1st October 2017, 11:46 AM   #2214
DUG is offline DUG  Canada
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Quote:
Originally Posted by Kjeldsen View Post
You misunderstand. Its not my phone that's the troublemaker. It's the amplifier.
I did not misunderstand.

The 50R is not to make your phone happy.

It is a value to be used with your phone to reduce the noise:

Quote:
Originally Posted by Kjeldsen View Post
...
But if I pause the musik on my phone, I get loud noise. Also if I have no cables in input, I get loud noise. Why?

...
Have you tried it yet?
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Old 1st October 2017, 12:37 PM   #2215
Kjeldsen is offline Kjeldsen  Denmark
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But I am not going to use my phone, so I need a solution that works no matter what source I use. And since I don't experience this with any other amplifier I own, something must be missing on this amplifier module. Perhaps it's not intended to be used with a signal directly on the board, but intended to be used with some kind og preamplifier.
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Old 1st October 2017, 01:10 PM   #2216
DUG is offline DUG  Canada
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As I said...I use a low impedance source.

Usually an LME49710 (or LME49720) and drive the amplifier with a balanced (differential) source.

I have not tried any tube based preamp so I cannot comment on those.

If the preamps you are using (or are going to use) has a low output impedance then it should work fine.

Some pix of my build.
Attached Images
File Type: jpg PRE-AMP.JPG (36.0 KB, 604 views)
File Type: jpg IMAG1810.jpg (685.0 KB, 611 views)
File Type: jpg IMAG1817.jpg (416.1 KB, 597 views)
File Type: jpg IMAG1847.jpg (302.9 KB, 590 views)
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Old 3rd October 2017, 06:30 PM   #2217
von Ah is offline von Ah  United States
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Whoa... DUG. You built a mechanical gear drive to turn two pots with one knob?!? That is the height of cool.
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Old 4th October 2017, 11:49 AM   #2218
DUG is offline DUG  Canada
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Whoa... DUG. You built a mechanical gear drive to turn two pots with one knob?!? That is the height of cool.
Ya, pot stays at about 50% so I don't need to worry about exact tracking at the low end.

Actually use the Laptop (video player) volume control.
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Old 11th October 2017, 06:05 AM   #2219
xrk971 is offline xrk971  United States
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Cheap TPA3118D2 boards, modding them and everything that comes with it
Quote:
built a mechanical gear drive to turn two pots with one knob
The clever man's 4-gang pot
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Old 6th November 2017, 06:56 PM   #2220
kebabfantast is offline kebabfantast
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Picked up a couple of Sanwu TPA3118D2-boards, or well, copies of the boards it seems. All the components have different names even though the layout is basically the same as the original Sanwu board. On my boards you have to remove R6 in order to lower the gain to 20dB. I removed R6 (R27 for all of you with different boards) before even hooking the boards up to test them out.

I have to say that they sound pretty decent, especially since they're only about 2€/piece. One thing I noticed is that the background hiss differs greatly from different SMPSs. I assume this is the case for all of you?

My FSP-120 AAC is unfortunately the worst offender of them all, but some random no-name brand 15V 3A SMPS provides the least background hiss.

Can anyone recommend any mods to the boards? Maybe replacing the filter capacitors with low ESR caps?

Last edited by kebabfantast; 6th November 2017 at 07:13 PM.
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