After making a stereo circuit board with a TDA2030 and mobile aux as input, I wanted to connect an MP3/BT module to my own indigenous audio amplifier circuit which would make every action easier I supposed, but things went wrong.
In mono circuit, the Bluetooth does not output that highly annoying noise but I want it to be stereo.
Below are the pictures of my MP3 module:
The module has 5 modes which are:
- Bluetooth mode
- AUX mode.
- Pendrive Mode
- SDcard Mode
- FM Radio mode.
In Bluetooth mode, the noise is produced much more than others, unbearable Bluetooth spike frequency sound, in AUX and Pendrive mode, the noise is quite low (bearable.)
In FM Radio mode, there is almost no noise.
Here is my circuit:
I also tried connecting some filters to the output of the MP3 module which were supposed to reduce noise.
That did not work at all.
When I connect the stereo circuit input directly to my mobile stereo output using headphone jack, it works very well until I connect the module again.
Any suggestions or helps please? Please point me my errors using a proper schematic which will make it easier to understand for me.