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Class D Switching Power Amplifiers and Power D/A conversion

TPA3116D2 Amp
TPA3116D2 Amp
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Old 12th September 2020, 08:12 AM   #11641
FauxFrench is offline FauxFrench  France
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Join Date: Dec 2017
Location: The mountains, calm and quiet.
Quote:
Originally Posted by king4joy View Post
.............................
If they are of 33 uH, after removing them, can I change them to 10 uH by removing 1/3 of the number of turns on it, and reuse them ?
..............................
Can a head phone jack be connected to the board ?
NO, inductance goes with the square of the number of turns so you need to keep 0.55 times the initial number of turns.

You can connect a head phone jack BUT you then need to use two dummy loads (6 Ohm or so) at the output terminals. You may ruin a class D amplifier by operating it without a normal impedance at the output. The output impedance serves as damping of the output filter resonance.
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Old 12th September 2020, 10:38 AM   #11642
Hofmann is offline Hofmann  Netherlands
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While prying off the heatsink I ripped an smd capacitor off.
The capacitor connects to ground on one side and through a 100k resistor to pin 2 and 3 on the other.

I believe it must be C58 in the datasheet schematic. Can anyone confirm that this is indeed so?
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Old 12th September 2020, 10:50 AM   #11643
FauxFrench is offline FauxFrench  France
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My impression is that it rather corresponds to C20, C21 or C57 on the schematic. A power rail decoupling capacitor.

Last edited by FauxFrench; 12th September 2020 at 10:53 AM.
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Old 12th September 2020, 11:05 AM   #11644
Hofmann is offline Hofmann  Netherlands
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I believe that C8/C22 on my board are supposed to be the PVCC decoupling blocks on the schematic.
It could very well be C57 in the schematic though.

It might worth a try to add all the decoupling caps according to the schematic to this board
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Old 12th September 2020, 11:06 AM   #11645
Trileru is offline Trileru  Romania
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Quote:
Originally Posted by king4joy View Post
I will confirm with the supplier that the chocks are at 33 uH before I buy. If they are 33 uH, I will change them to 10 uH.


It is easier to remove the chokes if I do not need to keep it intact.


And yes, almost one choke will cost more than the board !! The board cost only US$5.7 plus shipping!!!


If they are of 33 uH, after removing them, can I change them to 10 uH by removing 1/3 of the number of turns on it, and reuse them ?


How to pick the best type of chock for the application please if I need to replace them instead ? shielded ?, SMD ?, through hole ?, like the one on the picture of the 3rd amp ?, or air core ??


Can a head phone jack be connected to the board ?



You could in theory adjust the inductance value but in practice you are not going to be able to mod the inductor without destroying it.

You could buy something like this:
10PCS CDRH127R 12*12*7MM 10uH 100 Shielded Inductor SMD Power Inductor | eBay

I do not guarantee that they are up to spec but seems to be cheap. Or look for something similar. Should be ok if you are not expecting top performance at max power.


Quote:
Originally Posted by Hofmann View Post
While prying off the heatsink I ripped an smd capacitor off.
The capacitor connects to ground on one side and through a 100k resistor to pin 2 and 3 on the other.

I believe it must be C58 in the datasheet schematic. Can anyone confirm that this is indeed so?
Yes but it's not critical to operation. It would be good if you could replace it. It's there to filter noise on the power rail for pins 2/3.
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Old 13th September 2020, 04:27 AM   #11646
king4joy is offline king4joy  Hong Kong
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Quote:
Originally Posted by FauxFrench View Post
NO, inductance goes with the square of the number of turns so you need to keep 0.55 times the initial number of turns.

You can connect a head phone jack BUT you then need to use two dummy loads (6 Ohm or so) at the output terminals. You may ruin a class D amplifier by operating it without a normal impedance at the output. The output impedance serves as damping of the output filter resonance.

I plan to remove the chock by cutting the legs about 3-4 mm above the board, count and keep 0.55 times the initial number of turns, reshape the legs, and cut the rest of the wire away, and solder the choke back on the old legs on the board.


Or if you can tell me how to form a choke of 10 uH, I can DIY the choke with Litz wire of the same thickness, and solder it back onto the old legs on the board.


Could you show me a schematic as how to connect a head phone jack to the board please ?? And do I need to rewire the head phone to have a 4 wire input plug ?


Cheers.
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Old 13th September 2020, 04:56 AM   #11647
king4joy is offline king4joy  Hong Kong
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I have found similar chokes of 10 uH 10A : 10-1000uH?????065125????????DC-DC???????-???


I am asking if they can make the choke smaller, and with Litz wire (they sell Litz wire as well : ????QA???0.1*???????????PI?BUPI?????-???


They have not replied yet.
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Old 13th September 2020, 07:35 AM   #11648
bucks bunny is online now bucks bunny  Germany
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I use to remove this type of inductor using two soldering irons with a 5mm wide tip. Hot air to the pcb-bottom side will support this.
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Old 13th September 2020, 02:45 PM   #11649
Trileru is offline Trileru  Romania
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Quote:
Originally Posted by king4joy View Post
I have found similar chokes of 10 uH 10A : 10-1000uH?????065125????????DC-DC???????-???


I am asking if they can make the choke smaller, and with Litz wire (they sell Litz wire as well : ????QA???0.1*???????????PI?BUPI?????-???


They have not replied yet.

Sorry I just realized, if you have this type of inductor:
Click the image to open in full size.


on the amp you wish to buy, then it's pretty simple to remove with a soldering iron, and it's also pretty simple to modify, especially if you have a larger value and wish a lower value. just take out some turns.

You could math it out, and one extra/less turn shouldn't matter as long as you plan to shoot for anywhere between 10-15uH.

I thought your amp has the enclosed inductor type.

If you want to diy audio stuff you should really get at least something like this:

LCR-T4 ESR Meter Transistor Tester Diode Triode Capacitance SCR Inductance | eBay
Helps alot with measuring parts. It's not precise but it's better than nothing. Should be good enough to tell you if your inductor is 10uH or 20uH for example. That way you can take out turns and measure and see when you get close to 10uH.
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Old 14th September 2020, 03:34 PM   #11650
FauxFrench is offline FauxFrench  France
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Join Date: Dec 2017
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Quote:
Originally Posted by king4joy View Post
..........................
Could you show me a schematic as how to connect a head phone jack to the board please ?? And do I need to rewire the head phone to have a 4 wire input plug ?

Cheers.
Sorry for the late reply.
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