How to Make a Bluetooth Speaker Using an LED Light | Simple & Creative DIY

Have an old LED light lying around? Don’t throw it away! In this fun and creative DIY project, we’ll transform a simple LED bulb housing into a fully working Bluetooth speaker 🔊. This is a perfect weekend build for beginners, students, or anyone who loves electronics and upcycling.

Using just a few components like a Bluetooth audio module, 3W speaker, and 18650 battery, you can create a compact and stylish speaker that looks Amazing! 🎶

So, Let's get started.

To build your Bluetooth Speaker from an old LED bulb housing, gather the following electronic components and basic hardware:

1. PAM8403 Mini Audio Amplifier Module – Used to amplify the audio signal and drive the speaker efficiently.
2. Bluetooth Audio Receiver Module – Enables wireless music streaming from your smartphone or laptop.
3. Old LED Bulb Housing – Acts as the enclosure/body for the Bluetooth speaker.
4. 2"/2.5" Speaker (4Ω/3W or 8Ω/3W) – Produces the audio output.
5. 3.7V Lithium-Ion Battery (Rechargeable) – Powers the whole system.
6. TP4056 Charging Module – Safely charges the Li-ion battery via USB.
7. Mini Toggle Switch – For power ON/OFF control of the device.
8. RGB 5mm LED – Adds a colorful glowing effect inside the speaker.
9. Connecting Wires (Flexible) – For making all necessary connections.

1.Begin by carefully removing all the internal components from the old LED light bulb.

Open the bulb housing gently and take out the LED panel, driver circuit, and any other internal parts. Make sure the outer shell and the base of the bulb remain intact, as this will serve as the main body of our Bluetooth speaker.

2.Take the back side (base) of the LED bulb and create a proper opening for the Li-ion battery.

Using a soldering iron, make a neatly shaped hole that is large enough to fit the 3.7V lithium battery. Ensure the battery can fit inside the bulb smoothly.

3.Insert two wires through the input terminals of the LED bulb.

Pass a pair of wires from the inside of the bulb to the external input terminals. These wires will later be connected to the TP4056 charging module, allowing you to charge the Li-ion battery directly through the original bulb input.

It is very important to remember which wire is connected to the positive terminal (+) and which one goes to the negative terminal (–). Mark the terminals if needed, as this will help ensure proper charging and prevent short circuits during the final assembly.

5.Place the terminal tip back on the top of the LED bulb.

After routing the wires and preparing the opening, reattach the metal terminal tip to the top of the bulb base exactly as shown in the reference picture. This will give your project a clean finish and maintain the original bulb appearance while allowing the charging circuit to function through the bulb’s input points.

Take your 3.7V Li-ion battery and carefully solder a wire to its negative (-) terminal. Make sure the solder joint is strong and clean to avoid loose connections later.

After soldering, wrap the exposed terminal area with electrical tape to provide proper insulation—this is very important to prevent any chance of short circuiting inside the compact LED bulb housing.

Once the insulation is secured, gently place the battery inside the back cover of the LED bulb. Ensure it fits snugly and does not move around, as proper positioning will help during final assembly and improve the durability of your Bluetooth speaker. You can use hot glue to stick the battery.

In this step, take the front LED diffuser of the old bulb and carefully mark a circular outline matching the exact size of your speaker. Once the marking is done, use a soldering iron to cut out the circle slowly. This helps melt the plastic without cracking it.

After cutting, the edges will be rough, so smoothen the cut surface using sandpaper to get a clean and professional finish. Now take your speaker, solder the terminal wires properly, ensuring solid joints for better sound quality. Then insert the speaker into the cut-out section, adjust it for a perfect fit, and secure it firmly using hot glue so it stays in place without vibration or movement.

This completes the preparation of the speaker mount inside the LED diffuser.

Take a small SPST toggle switch, which will work as the main ON/OFF control for your Bluetooth speaker. First, identify the proper place on the front LED diffuser where the switch will be mounted. Mark the position and carefully make a hole using a soldering iron or a small drill so the switch fits perfectly.

Now, connect the switch like a standard SPST configuration:

1. One terminal of the switch will connect to the positive supply line going to the PAM8403 amplifier.
2. The other terminal will carry the output positive line that powers the amplifier.

Once the wiring is done, insert the switch into the hole and secure it firmly with hot glue so it stays in place and looks neat from the outside. Make sure the switch clicks properly and is easily accessible when the diffuser is assembled.

Now begin wiring all the components together as shown in the circuit diagram. Start by connecting the PAM8403 audio amplifier module, the Bluetooth receiver module, the 3.7V Li-ion battery, the TP4056 charging module, the toggle switch, and the speaker in their correct positions.

Carefully join the positive and negative terminals according to the wiring layout — keep the connections clean and avoid loose joints. The toggle switch will act as the main power control, so route the battery’s positive line through the switch before it reaches the amplifier and Bluetooth module.

Next, connect the speaker wires to the output of the PAM8403 module and ensure the Bluetooth receiver’s audio output pins go to the amplifier input. Finally, join the TP4056 charging module to the battery terminals so the battery can be safely charged from the LED bulb’s input wires.

Double-check all solder joints and ensure no wires are touching each other accidentally. Once all connections are complete, you are ready to assemble the components inside the LED housing.

Next closed the outer cover of the LED bulb.

In this step, we will convert the bulb holder into a convenient charging interface for the Bluetooth speaker system.

First, take the bulb holder and decide whether you want to use a Micro-USB or Type-C female connector for charging. Once selected, carefully solder the connector’s positive (+) and negative (–) pins to the corresponding terminals of the bulb holder. Make sure to double-check the polarity before connecting, as reversing the terminals can damage the charging module or battery.

After securing the connector, match the input +ve and -ve terminals of the charging module with the LED bulb’s original input wires that we prepared earlier. This ensures that when you plug in a charger, the power will flow correctly into the TP4056 charging module.

Finally, plug in a charger and keep it connected for a few minutes to confirm that the charging module LED indicators are working and the battery is receiving charge properly.

Now it's time to test the LED Bluetooth Speaker you have just assembled.

First, turn ON the toggle switch to power up the internal amplifier and Bluetooth receiver. You should see the RGB LED glowing with dynamic color effects, indicating that the circuit is powered correctly.

Next, open the Bluetooth settings on your phone, search for the Bluetooth device, and connect to it. Once paired, play any music track of your choice. You will immediately hear the audio output through the speaker installed inside the bulb housing.

Observe the beautiful RGB lighting patterns shining through the diffuser, which adds an attractive visual effect while playing music.

If everything works smoothly — sound output is clear and the RGB LED glows properly — then your LED Bulb Bluetooth Speaker is successfully completed.

Enjoy your new creation and have fun playing music wirelessly through your DIY speaker!

Transforming an old LED bulb into a fully functional Bluetooth speaker is not only a fun DIY experiment but also an excellent example of creative recycling. In this project, we integrated a PAM8403 amplifier, a Bluetooth audio receiver, a Li-ion battery with a charging module, a toggle switch, speaker, and RGB lighting—all inside the compact body of an LED bulb.

By carefully modifying the LED casing, installing the speaker, and adding charging functionality through the bulb holder, we successfully converted an everyday household item into a stylish Bluetooth speaker with glowing RGB effects. The final result is a compact, portable, and visually appealing speaker that delivers both sound and ambient lighting.

This project demonstrates how simple components and a bit of creativity can turn electronic waste into something exciting and useful. Enjoy your new LED Bluetooth speaker—and feel proud of building it with your own hands!