100 W portable bluetooth speaker

This boombox sounds pretty loud. 2x50 W speakers running on DIY 18650 Li-Ion battery pack salvaged from old laptop batteries. In a wine box.

esenes

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I wanted a bluetooth speaker insanely loud, cheap and long-lasting. 

[writing in progress]

6 × 18650 Li-Ion DIY 3s battery pack with built-in balance charger I did mine from old laptop batteries, check it put at https://hackaday.io/project/158720-18650-li-ion-3s-battery-pack-with-balance-charger
2 × 50 W speakers These are salvaged from an old car, 60 W 4 Ohm
1 × Wine bottle box
1 × XT60 connector
1 × 2x50W bluetooth amplifier board Here a TDA7492P amplifier board with bluetooth

Finished !
esenes • 06/19/2018 at 18:17 • 0 comments
Battery pack and balance charger
esenes • 06/19/2018 at 13:49 • 0 comments

Added the 3S2P LiPo battery pack from recycled laptop battery (see my other project). It is connected to the amplifier board through an XT60 connector and a switch is placed on the power cable.
The playback time at full charge looks to be around 6h, even though very volume dependent. After that the power is cut by the protection board of the battery pack, but just one of the three pack is discharged. Need to replace the faulty pack in order to boost the battery duration.
Final design
esenes • 05/30/2018 at 22:44 • 0 comments

Final schematic is here
Prototype in the box
esenes • 05/30/2018 at 22:42 • 0 comments

First prototype is in place ! The speakers are hosted in a wine bottle box and the amplifier is in place