Introduction: Recycled Portable Bluetooth Speakers

Picture of Recycled Portable Bluetooth Speakers

Hi All,

I feel good about recycling and in this project, I recycled 3 items

  • Speakers : extracted from old desktop speaker
  • Lithium ion battery from old laptop
  • Wood from left over / discarded stack

Features

  • Bluetooth / AUX in/ FM/ TF card
  • Ultra thin ( just 50mm)
  • Volume control
  • Remote control
  • 6 to 9 hr battery backup
  • Weight Less than 500 gms
  • Recycles speakers total output : 6 W

Step 1: What Do We Need

Picture of What Do We Need

Material

  • 2 Speakers ( 3 W each)
  • PAM8403 Amplifier with volume control ( 3w+3W)
  • MP3 / Bluetooth kit
  • 2 Li Ion Battery (18650)
  • TP4056 with Battery protection
  • 2 DC step up boost - MT3608
  • Wires
  • PlyWood
  • Switch - push button
  • Screws ( I extracted these from the original speakers
    • 8 screws to hold speakers
    • 8 screws to hold the back plate

Tools

  • Hammer
  • Fevicol / PVA glue
  • Black Spray paint
  • Soldering iron / wire
  • Hot gluegun
  • JigSaw with wood blade
  • Paper tape
  • Sand Paper ( 80, 150 and 220 Grit )

Step 2: Frame

Picture of Frame

To hold all the assembly, we will use 10mm plywood.

  • Cut a 2 pieces each of
    • 45mm X 180mm
    • 45mm X 100mm
  • Fix them at the edges at 90° as shown
  • Use fevicol or PVA glue
  • Use paper tape to hold all pieces in place
  • Let it dry for 4 hours
  • Using 80 grit sandpaper, make the edges smooth and straight

Step 3: Front Side

Picture of Front Side

  • Cut a 180mm x 110mm plywood or MDF ( 4 mm thickness)
  • Make 45mm diameter holes for speakers, Note that my speakers were 50mm diameter
  • Cut appropriate holes for
    • Bluetooth / MP3 plate
    • Volume control ( PAM 8403)
    • Switch ( Not show in images, as I forgot and I added it while working on the electronic stuff )
  • Spray paint black ( glossy) as shown

Step 4: Back Side

Picture of Back Side

  • Cut a 180mm x 110mm plywood or MDF ( 4 mm thickness)
  • Drill two hole for 16mm dia meter tube for bass as shown
  • Add required holes for TP4056 ( micro usb in)
  • and LED indicator ( I use a piece of stirrer for led indicator)

Step 5: Inside

Picture of Inside

  • Now to fix the speakers, we need to cut a mdf sheet (4mm thick) as shown
  • For battery fix two holder as show, we will hot glue battery on these, later
  • Let it fry for 4 hours

Step 6: Electronic

Picture of Electronic
  • Follow the logical circuit diagram ( each single line represents both positive and negative wires)
  • TP4056 is connected to battery and two MT 3608
  • MT3608 is set at 5 V for PAM8403 and 9 V for Bluetooth Kit
  • Output from Bluetooth kit is connected to input of PAM8403
  • Two speakers are connected to PAM8403
  • Test the circuit before Assembly

Step 7: Putting All Together

Picture of Putting All Together

Putting all together is difficult and take time, I fixed thing in following order

  • Power switch
  • PAM8403
  • Speakers
  • TP4056 and MT3608
  • Battery
  • Bluetooth kit

Pre-solder long wires to PAM8403, bluetooth kit and TP4056

Hot glue things in place

Step 8: Enjoy

Picture of Enjoy

After all the wiring is done, close the back panel. I used 8 screws to ensure no sound leakage.

Test it using different inputs like FM, USB etc

Improvement for furture

  • My speakers were 2w and output 3w, so disturbance at high volume
  • Current limited by TP4056 at high volumes, due to high current pulled by amplifier

Please share your comments, if you liked it

Comments

Surajit Majumdar (author)2017-10-02

Awesome speaker bro :)

thanks

sleepy120 (author)2017-09-30


Dont need 9v for bluetooth. Just bypass the 5V regulator lm7805 on the board and power directly with 5V (short left and right pin with solder).

As a side note, are there any bluetooth modules that default to bluetooth when turning on?

Amit_Jain (author)sleepy1202017-09-30

thanks, I will try this...

yes there are boards available with Bluetooth and amplifier together as well as separate that work at 5 v

ahmet_024102 (author)2017-09-29

where is the circuit

mxx (author)ahmet_0241022017-09-29

The connection diagram is at the beginning of Step 6. There is not really a circuit, as he uses already built components, commonly available.

Amit_Jain (author)mxx2017-09-29

Thanks

mxx (author)2017-09-29

Congratulations, nicely done! My kind of project!

Amit_Jain (author)mxx2017-09-29

thanks

Swansong (author)2017-09-29

That's a neat way to reuse all those parts :)

Amit_Jain (author)Swansong2017-09-29

thanks

About This Instructable

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Bio: I am IT professional, living in Bangalore, India. As new gadgets come out everyday, we indulge in spending significant time and money on these gadgets ... More »
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