Bluetooth 5w speaker

This is a first test and work in progress for a rechargeable Bluetooth speaker with the ability to be added / hung from a kids bike carrier for bike rides and competing in Parkrun.

Note: all components were glued inside after being wired outside. Might change design for easier access and work-ability as some areas are tight.

Parts used:

• 18650 battery and holder
  https://www.aliexpress.com/item/GTF-18650-3-7V-5000mAh-Battery-Rechargeable-Batteries-for-LED-Flashlight/32851953890.html?spm=a2g0s.9042311.0.0.27424c4di8Z4vA

• OEP30w 2 Channel Amp
  https://www.aliexpress.com/item/5-pcs-OEP30W-2-Double-Channel-Digital-Amplifier-Board-Module-Diy-Amplifier-Kit-30Wx2-D-Class/32810439202.html?spm=a2g0s.9042311.0.0.27424c4dE4jxaL

• USB Bluetooth audio receiver
  https://www.aliexpress.com/item/USB-Bluetooth-Music-Receiver-Adapter-3-5mm-Stereo-Audio-for-iPhone4-4S-5-Mp3-free-shipping/1602812680.html?spm=a2g0s.9042311.0.0.27424c4dtQ9CaQ

• Boost converter (needed for amp as only runs on 9v+)
  https://www.aliexpress.com/item/5pcs-lot-MT3608-DC-DC-Adjustable-Boost-Module-2A-Boost-Step-Up-Module-with-MICRO-USB/32834245300.html?spm=a2g0s.9042311.0.0.27424c4dpy1oVX

• 18650 usb battery charger (5v output as well)
  https://www.aliexpress.com/item/1PCS-5V-1A-Micro-USB-18650-Lithium-Battery-Charging-Board-Charger-Module-Protection-Dual-Functions/32467578996.html?spm=a2g0s.9042311.0.0.27424c4di8Z4vA

• Potentiometer with on-off switch as well
  https://www.aliexpress.com/item/High-Quality-B50K-50K-Ohm-Dual-Linear-Taper-Volume-Control-Potentiometer-Switch/32736114703.html?spm=a2g0s.9042311.0.0.27424c4dtkwIcG

• B0505S-1w isolation power supply (for isolated power supply to usb receiver)
  https://www.aliexpress.com/item/1pcs-B0505S-1W-5V-to-5V-converter-DC-DC-power-module-converter-1000VDC-Isolation/32840613546.html?spm=a2g0s.9042311.0.0.38594c4dh9QnqU

• 2 x 5w Full Range Speakers
  https://www.aliexpress.com/item/2pcs-2-inch-4ohm-5w-Vollbild-Speaker-mini-DIY-audio-subwoofer-loudspeaker/32656021955.html?spm=a2g0s.9042311.0.0.27424c4dPRFwbs

At full volume this thing is too loud to sit in front of comfortably