There you go.
Cut all traces at the output vias. Put the caps in series with the inductors (+++path), connect the side to GND (--- path). Connection to ground is the cyan line, the connection is made at the output filters GND connection. That should to it.
1000uF if roughly 2x470uF in parallel. Put +++ to the inductor.
If you are lucky, the SE channels are fullrange as well. But keep in mind, that the output coupling caps act as an highpass with the speakers impedance.
Attachments
Thanks Doc
can i see a schematic...i dont catch it today. if one TPA output is used for SE = e.g. outA outC is SE....i dont get it with L channel and Right channel....sorry...i got too much sun 😛😉
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There you go.
Cut all traces at the output vias. Put the caps in series with the inductors (+++path), connect the side to GND (--- path). Connection to ground is the cyan line, the connection is made at the output filters GND connection. That should to it.
1000uF if roughly 2x470uF in parallel. Put +++ to the inductor.
If you are lucky, the SE channels are fullrange as well. But keep in mind, that the output coupling caps act as an highpass with the speakers impedance.
And if I wanted to make 2.0? so it should be? I understand what else you need to replace m1-0 m2-0. and what else?
I do not understand, based on your scheme, where do I get the negative (-) line on the speaker? the capacitor which is marked in red “?” should I remove or leave that connects the + and - lines to the speaker?
free image upload
I sorry. took a closer look and understood your scheme) Question about 1000uF capacitor - what voltage?
Thanks so much. Last question. Can I remove some of the blue capacitors on the output lines from the Board, or should I leave them as they were originally?
I did the right thing or have mistakes? I tried to connect without a resistor on the subwoofer line, the ringing and hissing went away, but the low frequencies remained very loud.
About YJHIFI:
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The mission of Yuan-Jing is to provide you with the good audio products at comparative price from China. You can get all the audio boards and related parts you like in this website. We hope everyone can learn the art of audio and build his/her own audio system.
We promise to:
Provide Customer support.
Offer our customers the low wholesale price.
Streamline the buying and paying process.
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Ensure the good quality of our products.
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@doctormord you are obviously not qualified to understand the sofistification of this cirquit 🙂
Maybe mail the customer support of YJHIFI, they sure will explain electronical basics to you!
Our Business
The mission of Yuan-Jing is to provide you with the good audio products at comparative price from China. You can get all the audio boards and related parts you like in this website. We hope everyone can learn the art of audio and build his/her own audio system.
We promise to:
Provide Customer support.
Offer our customers the low wholesale price.
Streamline the buying and paying process.
Deliver goods to our customers all over the world with speed and precision.
Ensure the good quality of our products.
Help you design and manufacturing in China.
And:
Custom Made, Small Lot Order, OEM, Electronics Manufacturing Service
@doctormord you are obviously not qualified to understand the sofistification of this cirquit 🙂
Maybe mail the customer support of YJHIFI, they sure will explain electronical basics to you!
Most of all in this story, I am surprised to those people who listened to it and put 5 stars to the seller, to the goods, wrote good reviews. They sold so much of this **** all over the world and far from for $ 20 and for $ 80-90, so much is the original board from TI.
The aliexpress dispute was approved by me at half the cost, since I initially opened it only because of noise and bad sound.
Now I am trying to remake the board as shown by the respected @doctormord. I am very grateful to him for such active participation in my problem) and I will definitely contact YJ on this issue.
The aliexpress dispute was approved by me at half the cost, since I initially opened it only because of noise and bad sound.
Now I am trying to remake the board as shown by the respected @doctormord. I am very grateful to him for such active participation in my problem) and I will definitely contact YJ on this issue.
Yeah, maybe it works like intended and I don't understand it. Haven't seen this arrangement yet.
Hi Doc
can you help me to understand the way how it works stereo 1xBTL +2SE with 1 chip. i am too stupid...i dont catch it.....😱
can you help me to understand the way how it works stereo 1xBTL +2SE with 1 chip. i am too stupid...i dont catch it.....😱
Maybe a missunderstood genius at work.
Wonder wether he wanted to realize some kind of passiv high pass for the satellite speakers, which does not work the usual way, as these amps dont drive capacitive loads.
There is no Chinese board with a working 2.1 x-over on the market. Maybe they have not translated audio filter books yet? Or, there is nothing to copy in the West.
Wonder wether he wanted to realize some kind of passiv high pass for the satellite speakers, which does not work the usual way, as these amps dont drive capacitive loads.
There is no Chinese board with a working 2.1 x-over on the market. Maybe they have not translated audio filter books yet? Or, there is nothing to copy in the West.
See, you usualy use these chips in bridge mode. One chip= 4 single ended amps. Because of the single voltage supply, they need a capacitor (here 470 uF) to get the DC away.
If you bridge these 4-amp chips, you do not need these DC blocking output capacitor. Of course, you now have only a stereo amp left!
2.1 uses 2x single ended and one bridged, makes 3 channels.
If you bridge these 4-amp chips, you do not need these DC blocking output capacitor. Of course, you now have only a stereo amp left!
2.1 uses 2x single ended and one bridged, makes 3 channels.
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I am very sorry ... i am an idiot...i was "fixed" in my head at the inputs...BTL.... 🙄this was the reason i didnt catch this.........aaaah this heat/sun... 😉
TPA3255 DS:
in SE mode.....OUTC and OUTD are the single ended output channels and OUTA and OUTB are the BTL channel for 2.1 operations
thx chris
TPA3255 DS:
in SE mode.....OUTC and OUTD are the single ended output channels and OUTA and OUTB are the BTL channel for 2.1 operations
thx chris
SE mode:
disadvantages:
DC Speaker Protection is disabled in SE mode operation.
less power
more distortion
disadvantages:
DC Speaker Protection is disabled in SE mode operation.
less power
more distortion
I now understand the circuit YJ is using here, it is fine and has two advantages.
- DC blocking caps only need half the voltage rating
- DC blocking caps only need half the ripple current rating
So it should do as build if the layout is sufficient.
- DC blocking caps only need half the voltage rating
- DC blocking caps only need half the ripple current rating
So it should do as build if the layout is sufficient.
Do you mean that the YJ scheme is correct? or is it a joke? I did as indicated by you, the sound became normal, there is no busting with high and low frequencies, the sound is uniform. I really didn’t find capacitors for 1500uF, it’s night here, and set it to 2200uF. I do not know what it affects. and yet I did not understand and did not make the jumper that you have in the picture drawn from the TPA3255 itself to the ground. I did not understand from what contact 3255 to take it. there are two problems left, the noise is still there, but I think it is because of Bluetooth and the second does not respond to the rotation of the bass knob. but now I can listen to him and not suffer) thank you very much!