Wireless speaker-amplifier PAM8403 + Bluetooth - squeaks in the speakers

Hello
I wanted to do, or actually made, a wireless bluetooth speaker to listen to music from the phone.

I used the following parts:
- TP4056 with protection - li-ion cell charger
- Sep up 5V converter
- PAM403 amplifier with potentiometer
- Yet M1 bluetooth transmitter
- 2x 3W 4Ohm speaker
- 4 x 2500mAh cells

I connected everything as in the attached diagram (sorry for this drawing, but I can't do otherwise )
Everything "almost" works well, except that there is a squeal in the speakers when the power is connected and the squeaking (hum) does not stop when the track is played. There are no squeaks (as if a hum) when connected directly to the phone with a jack cable. I do not know if the fault lies with the wires that connect the bluetooth module with the amplifier, or maybe it is about power filtration (I read, but I do not really know what and where, I only know that I would have to use a capacitor)

As for the attached drawing, 4 li-ion cells connected in parallel, a bluetooth module connected via usb to the step up converter, which gives 5V at the output and 2 + and - wires soldered from the bottom of the converter to power the amplifier, the rest is probably clear.

Is this connection correct or can you lead the wires from the TP4056 charger directly to the amplifier? Of course, there is a power cut-off switch in front of the inverter.

I am asking for help in solving the problem.

-----

I noticed that the problem is with the power supply. If I connect the bluetooth module to a separate power supply other than the amplifier, the squeaks stop, so the question is how to connect everything to one power supply?

Probably the masses must be separate, that is, you only have to use the battery for bt or build a power supply yourself because you will not come up with anything on this converter

There is no other option? The use of a mass separator, bluetooth connection directly to the cells or a second converter. I understand it's useless?
It can not be done on this converter, and on what?

You have to make a power supply yourself or give batteries for bt

I connected everything to the powerbank that I had separately. I connected a USB cable to its socket and I led out the plus and minus with which I powered the entire system. It's so much better. But it could be better. Slight noises (practically not disturbing) are still audible. Apparently the problem was with the power supply (possibly a faulty converter). I will still test and let you know.
Thank you for your help
Well, noises (slight squeals) are audible, this type is there. You need to buy a more expensive board, which is a 2-in-1 bluetooth amplifier.

I close the topic