Bluetooth Speaker

thingiverse

I thought it would be a great and entertaining idea to build a Bluetooth speaker. So I used Fusion 360 to create a speaker design. This is still a prototype, so the design might change. I used two 3-watt speakers and a compact amp for the actual sound production. Instead of using an li-ion battery, I opted for a 2s lipo as my power source. Note that the Bluetooth receiver operates on 5 volts, while the 8.4-volt lipo would blow it out. However, when you connect a step-down module to the receiver, it produces a terrible sound due to ground loop issues. That's why I connected a 5v to 5v isolating converter to eliminate the hum. For the power switch, I used a simple mosfet to turn 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 You can use this design to create your own speaker, but please do not sell it.