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Class D Switching Power Amplifiers and Power D/A conversion

TPA3116 - need some help
TPA3116 - need some help
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Old 14th November 2019, 12:59 PM   #11
FauxFrench is offline FauxFrench  France
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Found a potentiometer of this type in my stock. It seems that the axis is not electrically connected to the mid-pins. You can ground the axis and voltwide is (once more) right.
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Old 14th November 2019, 01:02 PM   #12
Igla is offline Igla  Slovenia
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Thanks for the help.
I will try as soon I get home. I'm stil at work now.
I will also check with multimeter if metal parts of housings of the pots are connected to ground.
Otherwise I would need to desolder the pots to measure the value. I couldn't find anything written on the housing of the pots.
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Old 14th November 2019, 01:04 PM   #13
Igla is offline Igla  Slovenia
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'' Found a potentiometer of this type in my stock. It seems that the axis is not electrically connected to the mid-pins. You can ground the axis and voltwide is (once more) right. ''

Thanks. I will play with the amp when I get home and post the results.
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Old 14th November 2019, 01:09 PM   #14
Igla is offline Igla  Slovenia
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I forgot to ask...
The housing of the pots - do I connect them to signal or to power ground?
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Old 14th November 2019, 03:25 PM   #15
29285 is offline 29285  Europe
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Quote:
Originally Posted by Igla View Post
I forgot to ask...
The housing of the pots - do I connect them to signal or to power ground?
Providedl the case has been isolated this should make no difference at all.
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Old 14th November 2019, 06:02 PM   #16
Igla is offline Igla  Slovenia
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Well; I did ground the housings of potentiometers and the thing got worse. I got more hum.

Can you try to touch the negative supply terminal to the amplifier to see if you get the same noise/hum?
If I touch negative supply the amp gets dead quiet.
Does that mean it has a ground problem somewhere in the circuit?
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Old 14th November 2019, 08:20 PM   #17
Turbowatch2 is offline Turbowatch2  Germany
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If you can, shoot a picture how you grounded the pots. Usually this should work. You may, amp and power off and discharged, measure the resistance of the pots metallic part to ground. Should not show any value.

The output filter problem could be minimized by running the output lead 2-3 turns through two ferrite rings, near the board.
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Old 14th November 2019, 10:59 PM   #18
Douglas Blake is offline Douglas Blake  Canada
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Quote:
Originally Posted by Igla View Post
Well; I did ground the housings of potentiometers and the thing got worse. I got more hum.
What are you using for your power supply?
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Old 15th November 2019, 06:49 AM   #19
Igla is offline Igla  Slovenia
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'' If you can, shoot a picture how you grounded the pots. ''
Each pot with a short wire from housing to ground pins of the pot. Perhaps I should solder those wires to the same point like PS negative pin?

'' What are you using for your power supply? ''
I'm using 19V 5A laptop power supply which seems to work OK with my other TPA amps.
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Old 15th November 2019, 09:52 AM   #20
Turbowatch2 is offline Turbowatch2  Germany
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Ground the metal part of the pots at the power ground. You can connect the pots with one wire in a row and then go to power - negative = ground. Many of these pots hum, they get silent when screwed to a metal case that is grounded. Otherwise you have to use such a wire.
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