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Class D Switching Power Amplifiers and Power D/A conversion

SANWU TPA3116 + CSR8635 Bluetooth 4.0 - Noise Fix
SANWU TPA3116 + CSR8635 Bluetooth 4.0 - Noise Fix
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Old 9th May 2018, 07:56 AM   #211
krlskndl is offline krlskndl  Spain
diyAudio Member
Join Date: May 2018
Default About AUX input commutation to avoid POP noise

Hi guys!
I'm new in this forum. In first place let me thank you for all your valuable work and information.
I'm working on a project with a module using the CRS8635 and have the same problem about the pop noise when audio streaming stops.
I reached this forum and found the activation of the AUX input as a very clever and smart solution.
I've tried it with, unfortunately, no success. It seems that the amplifier is powered off after about 3 seconds after the A2DP stream stops an turned ON again (for the AUX input) after about 120 ms, as you can see in this capture:
So, the "pop" noise due to the negative edge in the DC voltage is still there.
I think that the best sollution woud be to find the way to avoid the powering off of the output amplifier of the CSR chip. I suppose it should be possible with any of the hundreds of PSKEYS, but wich one???
Does anyboy have any clue about it?
Thank you very much to all of you and, please, sorry for my english!
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Old 11th May 2018, 11:39 AM   #212
mraas is offline mraas
diyAudio Member
Join Date: Apr 2018
Hi Guys,

first time poster, long time lurker.

after 5 weeks of waiting I finally received this. the BT 4.2 aptx low latency version : SANWU(R) 50W+50W TPA3116 HIFI-Class Wireless Bluetooth 4.2 Amplifier Support APTX Low Delay Sale - Banggood.com

tried it, sounds really good, but also BT hiss... haven't tried the aux in jack yet.
So, before examining the Diff2SE stage I'd post some pictures here:

also todo: figure out the break-out connection on the front, I know already a couple of the pins lead to the bottom of the CSR BT module.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 10th June 2018, 07:00 PM   #213
AdidasNMD is offline AdidasNMD
diyAudio Member
Join Date: Jun 2018

This isn't a question about the sound quality (yet), but with some of the technical knowledge on display some have on here you may be able to help.

I've bought this board. Click the image to open in full size.

I needed the one with the input jack and bluetooth and unfortunately I got the one with bluetooth only.

Rather than get rid of the board I thought I'd try soldering a jack to the pins itself. Would they need to be connected to the TPA3116 chip, pins INNB, INPB, INNA, INPA?
Or would it be the LINE_AN/AP and BN, BP on the bluetooth module?

Would be grateful for some input on this.

Last edited by AdidasNMD; 10th June 2018 at 07:19 PM.
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Old 19th July 2018, 08:00 AM   #214
FantomXR is offline FantomXR
diyAudio Member
Join Date: Nov 2013
Hey people,

I need your help... I tried everything and I can not get it working.

See attachment for the board, that I have.
It has a CSR8635 on board.

As you can see it has solderpads underneath, which should be SPI_EN, GND, VBAT, MOSI, CLK, CSB and MISO.
I connected MOSI, CLK, CSB and MISO to my FT232RL module, which I also attached.

I also connected VBAT to 3V3 to FT232RL and 1V8 from CSR to the VCCIO-pin of the FT232RL.

And here is the problem: As far as I know SPI_EN should be pulled high for programming. But as soon as I connect a 10k between SPI_EN and 1V8 (or 3V3), the CSR won't boot anymore... at least the LEDs are not working. Also I can not get BlueSuite to recognize the CSR. Of course I followed all steps from GitHub csr-spi-ftdi.

What do I overlook?!

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File Type: jpg 7177F9o6SNL._SL1000_.jpg (152.4 KB, 12 views)
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Old 19th July 2018, 10:33 AM   #215
doctormord is offline doctormord  Germany
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The 1V8 is derived from the CSR itself, no need to connect to the RL. Does the RL do work with 1V8 signal levels at all?
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Old 19th July 2018, 10:37 AM   #216
FantomXR is offline FantomXR
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Join Date: Nov 2013
I thought it works with 1V8 signal level. What would you suggest?
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Old 19th July 2018, 09:44 PM   #217
mraas is offline mraas
diyAudio Member
Join Date: Apr 2018
hi guys…

quick question about the bluetooth board on these amps…

I've desoldered mine and took it of because I'd like to use the amp just with a line input for my application..

as the bluetooth board has aptx I'd like to use it for a ifferent application..
so, powered connected vbat and gnd and the line outs, but when applying the appropriate voltage (4.2v) it doesn't start up.. (eg. not found thourgh cell Phone bluetooth).. I've not conneted any leds yet.

Anyone knows if I need to connect something different first before the board powers up? (i know I've desoldered more than the 6 leads I've soldered on now, buy mainly pinouts to the connector on the front, see a couple of posts ago)

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Old 23rd July 2018, 03:31 PM   #218
Ratskie is offline Ratskie
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Join Date: Jul 2018
Originally Posted by ivicanikolic034 View Post
Thank you very much!!!
I did it, and it works! Noise is no more present!

But i have a feeling that speakers are quieter now, volume is lower i think... Is this normal?
I got this Bluetooth amplifier thesame.
When I power on beep on speaker, I connect my Android. Connected, and play some music, after a several seconds no sound but still Bluetooth connection remain and I can control the bottom.
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