Mini Bluetooth Speaker

In this video tutorial, we'll show you how to make a DIY Bluetooth speaker from scratch using basic electronic components. This step-by-step guide is perfect for anyone who wants to create a unique, homemade Bluetooth speaker that sounds just as good as store-bought models.

In this step-by-step guide, you'll learn everything you need to know to assemble a fully functional Bluetooth speaker. From selecting the right components to wiring and testing your final product, we've got you covered.

This DIY Bluetooth speaker project is perfect for anyone who wants to create a unique and personalized audio experience. Whether you're a DIY enthusiast or just looking for a fun weekend project, this tutorial is for you.

So if you're ready to build your own Bluetooth speaker and take your music listening experience to the next level, grab your tools and let's get started!

Items listed from left to right:

1. Speakers
2. Bass diaphragm
3. Bluetooth Module
4. DC Step-down Module
5. 3.7v Battery (2x)
6. Battery Protection Board
7. Switch
8. Male-Female Connectors
9. Wooden Board
10. Solar Film

The base of a good project is to visualize what you want to achieve and then put it on paper or sketch it. I decided to sketch it directly on the wooden board. This way you know the lines you need to cut to have even pieces. Picture number 3 shows the dimensions I used to make the Mini Bluetooth speaker enclosure. We have to drill 35 diameter holes for the speakers and for the bass diaphragm. Last picture shows the drilled holes and filling process to fit the speakers into the holes.

I did not have paint at home and on top of that it is quite expensive therefore I decided to use solar film that you normally use to shade car windows. Its way cheaper and it looks pretty cool! You just have to cut a bit more than each parts dimension and then glue it with gorilla glue. Its super handy and fast! This way you have original personalized speakers.

Third step is to solder the batteries in series, meaning that you solder red wire with black wire. This will sum both the potential difference to 7.4 volts. This way we have enough voltage to power up the bluetooth module and the speakers.

I would recommend using heat shrink tubes to make the solder point between red and black wires are insulated from the rest. This way we ensure that batteries never short.

Another recommendation is to connect the batteries via male-female connectors. In case one of the batteries fails you can easily change it without any soldering action. Make sure you plan where to install the components since there isn't much space! See as an example picture 3.

Now it's time to connect the batteries to the battery protection board. This board will protect your circuit from the batteries in case of short and also allows you to charge the batteries when needed. I also recomment to use male-female connectors for this matter as you can see in picture 1.

Then we need to solder the On/Off switch button to the battery protection board. This switch will act as the main button of the circuit. If it is open (OFF) then no energy flows in the circuit. If it is closed (ON) then we allow energy flow in the circuit and we can connect our device to the speakers to enjoy music.

The step down module plays an important role in this circuit. The arrow in picture 3 shows the direction the energy flows. Solder the switch to the positive side of the step down module and the black wire to the negative side. This is a small screw (picture 5) that you can tighten or loosen the let more or less voltage through the module. We want to feed the bluetooth module with about 5v. Use a multimeter to see how much it is passing through.

Now we need to connect the step down module to the bluetooth module. Follow the + and - signs to solder red and black wires as in picture 1. Once it is correctly soldered you just have to insert the male connector into the female connector of the bluetooth module.

Now it's time to check if the circuit is working by turning on the switch. As you can see in picture 2, the blue light is turned on indicating that it works. I decided to fix the circuit to the wooden base with a double sided tape which you can also observe in image 2.

Let's focus on the enclosure now. We need to cut the solar film with an x-acto knife to be able to insert the speakers in the holes. The enclosure should look like picture number 2.

I used superglue to glue the bass diaphragm to the enclosure. The speakers were inserted under pressure but I also used glue to make sure they stay well fixed. See picture 3 & 4 as examples.

Since we have the possibility to charge the batteries through the battery connection board, we need to make sure the USB cable fits in the enclosure. Measure the space needed for you USB cable and then make room in the enclosure for it. Don't forget to test it like in the images!

Let's solder the speakers to the connectors that will later on link them to the bluetooth module. In this case you don't have to pay attention to polarity. You can solder the wires to whichever speaker entry you prefer.

The energy flows from the battery to the battery protection board. Once the switch is turned on the energy goes to the step down module and then to the bluetooth module where the speakers were just plugged into. Use picture 2 as a visual help. This is the whole circuit put together.

Picture 3 shows how to connect the speakers to the bluetooth module.

Now you just need to finish closing the enclosure and you are good to go! Congratulations if you made it this far, now you have a do it yourself mini bluetooth speaker and much more knowledge about electronics!

These two books helped me throughout my journey in electronics therefore I'd like to recommend:

Electronics All-in-One for Dummies

Circuit Engineering

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