P8095-4 - Whistling noise with decreasing frequency

Kits Audio Hi Fi Projects
1

Hi,

I’m working on an MP3 radio for my small one based on the P8095-4 kit. I started with the kit and it worked fine, so I concentrated on the housing and periphery. Now, that I have everything together, there is a problem.

I can turn on the kit and the red LED is on. Even without starting playback, the voltage regulators and the amplifier get very hot. When I turn on playback using the Play/Pause button, I can hear a whistling noise on both channels with decreasing frequency and volume. Again, the voltage regulators and the amp get very hot. There is no sound from an MP3 and I did not run it in that state longer than 10s.

Do you have an idea, what the problem could originate from?

Best regards, Andreas

2

Have you checked the power supply voltage is OK?

3

It is ok. I used a 12V power supply and an 11V LiPO. Both worked fine before (whatever happened), but both show the same effect now. Another idea? :slight_smile:

4

Maybe a broken solder joint or MP3 module fitting problem…