DIY: Portable Mp3/Mp4 Bluetooth Speaker

Homemade boombox, radio, sd/usb mp3/mp4 player
Mp4 board(New V): https://bit.ly/31pWvKg
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/32g6ErC
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/3a5hGTx

Drill Bit used : https://goo.gl/jmh3AP
or: https://goo.gl/VpJbLE
Multi charger: https://goo.gl/RzrCf8
Multimeter: https://goo.gl/n8whXr
"Wire holder": https://bit.ly/2xqq5Th

-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
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