Portable MP3 Player-Power Supply-USB Charger-Bluetooth Speaker

thingiverse

UPDATE 03.08.2018: I've added a holder part to carry the player, so print the relevant case_body and lid parts to make your player more portable. You'll need m3x4x3 brass inserts to assemble the whole body. **BOM:** * 3 inch 8 ohm 5 watt speakers: https://www.aliexpress.com/item/2pcs-lot-8-ohm-5W-5Watt-78MM-3inch-Square-Speaker-Waterproof-Clear-Cone-Paper-Bright/32711943421.html * PAM8403 2x5W amplifier with potentiometer: https://www.aliexpress.com/store/product/Super-Mini-PAM8403-DC-5V-2-Channel-USB-Digital-Audio-Amplifier-Board-Module-2-3W-Volume/1678083_32753590149.html * MP3 Decoder Board: https://www.aliexpress.com/item/Wireless-Bluetooth-Audio-Decoder-Board-Module-MP3-Player-LED-MP3-decoder-board-FM-AUX-12V-USB/32862365042.html * 3S BMS with balance: https://www.aliexpress.com/store/product/3S-25A-lipo-lithium-Polymer-BMS-PCM-PCB-battery-protection-board-for-3-Packs-18650-Li/1916536_32806077657.html * DC Power Jack: https://www.aliexpress.com/item/Mayitr-10Pcs-DC-Power-Jack-Socket-Female-Panel-Mount-Connector-High-Quality-Black-DC-Power-Jack/32817267539.html * Rocker Switch (2Pcs): https://www.aliexpress.com/item/10Pcs-Ship-Type-Switch-15X21-KCD1-101-Red-2Pin-6A-250V-ON-OFF-15-21/32801619891.html * USB Car Socket: https://www.aliexpress.com/store/product/Dual-Usb-Car-Charger-Socket-5V-2-1A-1A-Waterproof-Motorcycle-Vehicle-Auto-Car-Power-Adapter/1394861_32756332405.html * DC-DC Step Down Module (for amplifier to step down the voltage to 5V): https://www.aliexpress.com/store/product/5PCS-Mini-Converter-Adjustable-DC-DC-Step-down-Supply-Module-replace-LM2596-new/1924864_32884127914.html * Banana Socket: https://www.aliexpress.com/item/10pcs-4mm-Fine-Copper-Banana-Sock-Audio-Speaker-Amplifier-Cable-Wire-Power-Screw-Sheath-Stretch-Flex/32822116945.html * Bolts, nuts, spade terminal connectors (4.8mm, 6.3mm), M3 Brass inserts (M3x4x3mm), Cables **Printing:** The case needs support to print. Layer height is up to you; I've printed with PLA. **Battery Pack:** I made a 3S5P li-ion battery pack using my spot welder. To charge and use it conveniently, you need a BMS with balance function. Here's my spot welder and probe to make the 18650 battery pack: https://www.thingiverse.com/thing:3032060 **My Cable Connections** One rocker switch powers the mp3 player and the step down converter (so the amplifier). The other switch powers the USB charger and voltmeter. Connections to the main battery are made by Wago Connector: https://www.aliexpress.com/item/10pieces-PCT-213-PCT213-WAGO-222-413-Universal-Compact-Wire-Wiring-Connector-3-pin-Conductor-Terminal/32845923996.html The charger socket and banana sockets are directly connected to the battery.