Carbon Bluetooth Speaker Build
This one looks killer bro. Awesome. Wish I had those wood working stuff. I am still working with lunch boxes. :D You can use ground loop isolators to remove humming noise due to bluetooth. Also the bluetooth receiver which you used doesn't have a stereo output. Even though it has 2 separate channel outputs, both channels mixed inside the board. If you open it you can see it yourself.
You can use ground loop isolator to remove the humming noise.
Make Your Own Desktop LED Lamp
Pimp Your Car's Stereo. Adding Bluetooth to Your Head-unit. ($2,- Project)
No cap across voltage, I use PAM 8403 and have the same issue in my car which uses a creative sbs 270's amp. Its a ground loop issue, it's a very common issue with DIY bluetooth projects. Fitting a ground Loop Isolator can fix this.
Hi, nice work mate, wasnt there any ground loop noise?I had ground loop noise issue with mine since the bluetooth and amplifier boards share the same ground. Now I waiting for ground loop isolator from Aliexpress for my second project.
DIY Supercharged Bluetooth Speaker (v2.0)