Bluetooth 5w speaker

thingiverse

This rechargeable Bluetooth speaker was designed for kids bike rides and Parkrun competitions, but its loudness makes it unsuitable for indoor use at maximum volume. A first test and work-in-progress design was created using the following components: an 18650 battery and holder, a OEP30w 2-channel amp, a USB Bluetooth audio receiver, a boost converter, an 18650 usb battery charger, a potentiometer with on-off switch, a B0505S-1W isolation power supply, and two 5W full-range speakers. Note: all components were glued inside after being wired outside. The design may be modified to make it easier to access and work with as some areas are quite tight. The used parts include: * An 18650 battery and holder from GTF-18650 (https://www.aliexpress.com/item/GTF-18650-3-7V-5000mAh-Battery-Rechargeable-Batteries-for-LED-Flashlight/32851953890.html?spm=a2g0s.9042311.0.0) * A OEP30w 2-channel amp from a 5-piece pack (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) * A USB Bluetooth audio receiver from USB Bluetooth Music Receiver Adapter (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) * A boost converter from MT3608 (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) * An 18650 usb battery charger from a single piece (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) * A potentiometer with on-off switch from High-Quality B50K (https://www.aliexpress.com/item/High-Quality-B50K-50K-Ohm-Dual-Linear-Taper-Volume-Control-Potentiometer-Switch/32736114703.html?spm=a2g0s.9042311.0) * A B0505S-1W isolation power supply from a single piece (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) * Two 5w full-range speakers from a two-piece pack (https://www.aliexpress.com/item/2pcs-2-inch-4ohm-5w-Vollbild-Speaker-mini-DIY-audio-subwoofer-loudspeaker/32656021955.html?spm=a2g0s.9042311.0)