Step 1: Preparation
1. 50W x 2 bluetooth amplifier module. works with 8-25volt
2. 2 binding posts
5. Volt meter (to determind the battery)
6. 4 of 18650 Li-on 2200mah (salvaged from labtop batteries)
8. soldering iron/wire
10. tools to cut/drill/sanding
11. PCB stand off (or spacer . i am not sure how they called it)
Step 2: Drilling
, wires , switch and the volt meter.
Step 3: Paint Job (optional)
2. paint it with black colour. why? Even it is already black but water transfering film attached to the painting better than the plastic.
3. Do the transfering . Sorry that I didnt have pictures in this step. I am doing this alone so it difficult to take photo while doing the water transfering.
4.wait until dry and apply lacqure for shiny finished.
Step 4: Put Everything Inside
WARNING!!!! REMOVE THE BATTERIES BEFORE CONNECTING WITH EXTERNAL ADAPTER.
2.mount the binding posts
3.mount the switch and volt meter
4. connect the wire from Positive 12v input to the switch.
5. Insert the wires from the back side and solder to the same spot of 12v input with the switch ( I will connect these wires to the 18650 batteries.)
6.connect the positive wire of the volt meter to the other side of the switch (not the same spot with 12v input.)
7. connect all the ground(negative) wires to the negative point of the 12v input.
Step 5: More
2.mount the pcb to the box.
3.solder the speakers out to the binding post.
4. solder the positive from the amplifier to the other side of switch.( yes. not the same spot with 12v input)
Step 6: More
2.connect the back side wires to the battery holder. MAKE SURE THAT YOU CONNECT IT TO THE RIGHT SIDE 1 )+ -
3.Attach the battery holder to the box with 3M 2sided mounting tape.
Step 7: Done!!
The results is so great. I love it. The sound is super good and loud. I think the battery can last for more than 5 hours with normal volume (my normal is a bit loud lol)
ps. I have to charge the battery seperatly . since i didnt put any protection board to it , and for the best to battery do not let the voltage below 12v.
thanks for watching.
Sorry for my english skill.
Please feel free to ask any question.