DIY: Portable Mp3/Mp4 Bluetooth Speaker

Homemade boombox, radio, sd/usb mp3/mp4 player Mp4 module: http://bit.ly/2KwXQpz Or Mp4 big screen: http://bit.ly/2Zy69Ys Speakers: http://bit.ly/2JnErqR Amp module: https://goo.gl/fHMpEu Passive radiators: http://bit.ly/33NOIoc 18650 Batteries: https://goo.gl/ksddQG 18650 holder: http://bit.ly/2ytMDzT 4S PCB: http://bit.ly/2NHOgV2 4S meter: http://bit.ly/2xERm1c DC module: https://goo.gl/XPGaXg or https://goo.gl/ZsEU1N DC/DC isolator: http://bit.ly/2ZoYyuu Mini switch: http://bit.ly/2MKvw5j Power jack: http://bit.ly/2BMSMsw Drill Bit used : https://goo.gl/jmh3AP or: https://goo.gl/VpJbLE Multi charger: https://goo.gl/RzrCf8 Multimeter: https://goo.gl/n8whXr -Using dc/dc isolator B1212S to avoid ground loop/ "hum" effect. -Width 30cm, height 9.5cm, depth 12cm. -Pcb with cell balance function. -Schematic at 13:15 Copyright free music list: Kozah - Haha [NCS Release] Raven & Kreyn - Bubble [NCS Release] Jim Yosef - Moonlight [NCS Release] Ascence - Rules [NCS Release] Moving On (Instrumental) MBB & Jonas Schmidt [Vlog] Elektronomia - Heaven [NCS Release] Max Brhon - Humanity [NCS Release] Raiko - Lightning Child (-AIYIMA 3Inch LCD MP3 Decoder Board Bluetooth Audio Receiver MP4 MP5 HD Audio Video Hard Disk Player DTS Decoding DC8-24V -Audio Speaker 3 Inch 4Ohm 20W Full Range Bass Speaker Multimedia Loudspeaker Desktop -Xiaomi nextool flagship pro 16 IN 1 Multi-function EDC Tools Bottle Opener Screwdriver Pliers Ruler All In 1 Camping Multi-tool, with autolock saw and knife, With Tools Inner Lock) #DTekDIY