In this instructable I will try to show you how to make a simple but very cool cardboard bluetooth speaker.
My first instructable was the inspiration for this project.
Very easy project, only few tools needed. I used a lot of recycled pieces to build it.
The sound is amazing for a cheap cardboard speaker!
Step 1: Materials
Thick Cardboard Sheets
2x 15w 8ohm speakers
12v 18650 li-ion battery pack
HX-3S-FL25A 3 SBMS with balancing function
2x10w PAM8610 Amplifier
5v DC-DC Buck converter
Power Jack socket, 2.1mm Connection
Step 2: Speaker Box
Use a precision cutter to cut the carboard :
2 pieces 17cmx17cm (side panels)
2 pieces 17cmx26cm (top and bottom)
4 pieces 17cmx24,5cm (front and back -double)
6 pieces 2cmx22cm (speaker box handle)
Cut round holes for the speakers in both the front panels
Use a hot glue gun to join the cardboard sheets. Use it also for the speakers.
Make it airtight.
Step 3: Electronics
I made a 12v battery pack with li-ion 18650 cels - 3S2P
I added the hx-3s-fl25a-a BMS module because it has over discharge voltage protection and balancing function.
The PAM 8610 amp works with 12v. For the 5v bluetooth module I used a DC-DC 5v buck converter.
Step 4: Finishing
Use the hot glue gun to attach the 12v charging connector and all other electronics, amplifier, battery pack, bluetooth module.
Make two holes on top of the speaker box and attach the handle.
Use paint to make the front panel black.
Use glue to attach a piece of black cloth on the front panel.
I also used a piece of self adhesive bass insulation cotton on the double-back panel and a 10cm long 1inch bass reflex tube on the front. I don't know how this helped but the speaker sound is great :)
I hope you will try to make one and write a comment about it
Sorry for my bad english!