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The PAM8403 amplifier is very noisy

me_Cris

Hi!

I was thinking of participating in a challenge but I ran into another challenge. Sweat smile
I'm using a small circuit with PAM8403 as a replacement for some speakers with dead audio circuit. In addition, I also have addressable LEDs in the case (this how they came) and I was thinking of using an MCU to control them. But I just noticed a very sharp and annoying noise produced when I power the LEDs, and it doesn't go away even when playing music.
I made a msall PCB, the schematic is below. The power supply is at 5V [USB]. I placed some capacitors in the idea to support the supply voltage.
What ideas do you have? What could I improve? 

Thanks!

The schematic:

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The layout:

image

PAM8403 module:


image
The initial amplifier + controller board:

image
image

The speakers:
image

My assembly:

image

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  • i can see you have 3 seperate capacitor groups, Are you going to have 3 seperate amp boards,?

    where is the 5v coming from is it from a switch mode regulator or battery controller,?

    does this regulator have a biger size cap like 220uf where you are getting your feed from?

    can you make a second regulator to supply the leds seperatly ?

  • in reply to acdc90

    It's a single PAM8403 (the little circuit you can buy anywhere).

    It's a single power line, 5V via USB (so lots of options). I put in several capacitors to support the power.

    The old board contained the amplifier and a controller for the LEDs, but it is damaged.

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