Hi,
I have recently modified car radio case and added a a2dp module from eBay to it. It is the XS3868 ver 3.0.
But I have one problem. The sound works, the buttons too. But when I play sound using the a2dp profile (audio sink) and pause a audio track or don't play audio at all after 5 seconds a hum/buzzing sound starts (around 50hrz).
It is the same problem as another person had on eevblog.
Post #15 about the noise introduced after 5 seconds idle using Android a2dp profile, is the same as what I have.
Topic:
https://www.eevblog.com/forum/beginners/bluetooth-audio-someone/
Here is the diagram (shown in the video on the prototype board)
http://i.imgur.com/R752N7X.png
I have tried to hook it up to another amp, same problem. I tried headphones and those work without the buzzing sound after 5 seconds! I don't understand why..
Video of the buzzing sound:
https://youtu.be/9YBVj6Cl-cE
What am I doing wrong here, or what do I miss?
Maybe adding two 220n ceramic caps to audio out, will this really improve it?
Best regards,
ESXi
I have recently modified car radio case and added a a2dp module from eBay to it. It is the XS3868 ver 3.0.
But I have one problem. The sound works, the buttons too. But when I play sound using the a2dp profile (audio sink) and pause a audio track or don't play audio at all after 5 seconds a hum/buzzing sound starts (around 50hrz).
It is the same problem as another person had on eevblog.
Post #15 about the noise introduced after 5 seconds idle using Android a2dp profile, is the same as what I have.
Topic:
https://www.eevblog.com/forum/beginners/bluetooth-audio-someone/
Here is the diagram (shown in the video on the prototype board)
http://i.imgur.com/R752N7X.png
I have tried to hook it up to another amp, same problem. I tried headphones and those work without the buzzing sound after 5 seconds! I don't understand why..
Video of the buzzing sound:
https://youtu.be/9YBVj6Cl-cE
What am I doing wrong here, or what do I miss?
Maybe adding two 220n ceramic caps to audio out, will this really improve it?
Best regards,
ESXi
Last edited:
OVVC3860 Noise problem
i am facing the same problem here. i have put the 4.7 capacitor in 20th pin but noise remains the same
i am facing the same problem here. i have put the 4.7 capacitor in 20th pin but noise remains the same
The OVc3860 audio output is differential. So If You connect it to amplifier You should do this as differential input.
In fact on AGND of OVC3860 is avarange 0.6 V.
In fact on AGND of OVC3860 is avarange 0.6 V.
i fix this problem i use two 560 ohm resistor
An externally hosted image should be here but it was not working when we last tested it.