Introduction: ~$10 DIY Bluetooth Speaker

By About Me
About: I'm a senior software developer who loves working on projects involving software, electronics, woodworking, 3D printing and all things DIY.

Hi Guys,

This is my first Instructable, so please bear with me :)

I had a few home theater speakers that I was not using and initially I thought I could use the speakers for a Bluetooth speaker build that I was thinking of doing. I was about to remove the speakers from their enclosures, but realized that they were so well made and sounded great, I decided to leave them in their original box.

I used a single Lithium-ion 18650 cell which I salvaged from an old laptop battery pack.

Step 1: Parts List

Step 2: Tools List

  • Soldering iron
  • Solder
  • Wire
  • Helping hands

Step 3: Soldering Time!

Soldering:

  • Connect the positive terminal of the battery to the "B+" and the negative terminal to the "B-" on the TP4056.
  • Connect "OUT+" to the left leg of the switch and solder a wire from the middle leg of the switch to the 5V+ connection on the PAM8403
  • Connect "OUT-" to the 5V- connection on the PAM8403
  • The PAM8403 is a stereo amp so connect the two speakers by soldering wires from the amp to the speakers as shown in the diagram.
  • The amp will require input. This input will come from the Bluetooth module. The module is connected to the amp via a 3.5mm jack.

Once all your connections are done:

  • Turn the Bluetooth module on
  • Pair to a mobile device
  • Turn the switch on
  • Enjoy the music! :)

Step 4: Done!

Have a look at the video above where I go into detail about each component and a demo!