Bluetooth Speaker

I thought it would be a good and fun idea to make a bluetooth speaker. So I used Fusion 360 to design a speaker.

This is still a prototype so this design might change

I used 2 3-watt speakers and a small amp for the actual sound.
Instead of a li-ion battery, I used a 2s lipo as power supply.
Note that the bluetooth receiver works of 5 volt so the 8.4 volt of the lipo would blow that receiver. But... when you connect a step down module up to the receiver it gives a horrible sound due to a ground loop. That is why I connected a 5v to 5v isolating converter, so that the hum disappears.

For the power switch I used a simple mosfet to switch the speaker on and off.

Sound amp: https://nl.aliexpress.com/item/OEP30Wx2-Module-Class-D-Digital-Power-Amplifier-Board-Replace-TDA8932/32761426446.html?spm=a2g0s.9042311.0.0.27424c4dVXF8SD

Bluetooth receiver: https://nl.aliexpress.com/item/USB-Wireless-Bluetooth-Music-Stereo-Receiver-Adapter-AMP-Dongle-Audio-home-speaker-3-5mm/32700305867.html?spm=a2g0s.9042311.0.0.27424c4dVXF8SD

Step down converter: https://nl.aliexpress.com/item/RC-Vliegtuig-Module-Mini-360-DC-Buck-Converter-Step-Down-Module-4-75-V-23-V/32836074457.html?spm=a2g0s.9042311.0.0.27424c4d4fmnbN

5v to 5v isolating converter: https://nl.aliexpress.com/item/1PCS-B0505S-1W-5V-to-5V-converter-DC-DC-power-module-converter-1000VDC-Isolation/32793240102.html?spm=a2g0s.9042311.0.0.27424c4d4fmnbN

NOTE:
You can use this design to greate your own speaker but please do not sell this design.