Introduction: DIY Mini Bluetooth Speaker (BoombeAt :)

Picture of DIY Mini Bluetooth Speaker (BoombeAt :)

Hey Guys! It's my second instructable. I got great response at my previous BBox tutorial so I really thankful to all of you. If you really like this project than please VOTE for me and help me to make a winner :)

MEET BoombeAt :)

BoombeAt is a DIY ultra-portable wireless speaker with impressive bass and portable design. Featuring high performance audio performance with dual full-range stereo 35mm speaker and a passive driver. This versatile speaker allows you to stay connected with your friend with long lasting battery life. BoombeAt provides upto 3 days battery backup at continuous music playback with a single charge.


Pair with any Bluetooth compatible device including smartphones, MP3 players, tablets and computers. Play or pause music, change track, volume up/down, all without touching your phone.


In this instructable I'm going to show you how I made this portable Bluetooth speaker. So take your tools, We are going to build a great weekend project.


I made this project inspired from ASCAS's DIY Supercharged Bluetooth Speaker(v2.0). He is an awesome guy and formally known for his various DIY Speaker projects. I just gave my own touch on his project in this instructable. I really thankful to him :)

Speces & Features:

  • 3w*2 High Efficiency Amplifier( Class D)
  • Bluetooth 2.1 With SBS Decoding Audio Performance
  • Dual 3w Full-Range Speaker With Passive Radiator(4ohm-35mm)
  • Long Lasting 4000mAh Battery(2800mAh Li-po+1200mAh Li-ion) [2days playback]
  • Aux Ready
  • Command Buttons
  • Micro USB Charging

Here's the Sound test Video

Step 1: Parts List

Picture of Parts List

Time to select some proper parts for BT Speaker. These parts I'm using to build my BT speaker. You can use this parts. But if you find better parts then use those parts for better performance.

  • Bluetooth Module [$4]
  • 35mm Speakers (3w*2) [$1.5]
  • PAM8403 Stereo Amplifier (3w*2-4ohm) [$1.5]
  • Li-po and Li-ion Batteries (4000mAh) [Recycled]
  • Micro USB Charging Module With Battery Protection [$2]
  • Acrylic Sheet (4mm thick)
  • On/Off Slide Switch [3*Recycled]
  • 470uF Capacitor [1*Recycled]
  • 10k Resistor [4*Local store]

Tools & Equipment:

  • Rotary Tool
  • Screw Driver set
  • Glue Gun
  • Soldering iron
  • Baby Hacksaw
  • Sandpaper
  • Superglue
  • Cutter
  • Masking Tape

Step 2: Take Measurements

Picture of Take Measurements

Measure the acrylic sheet and mark it, then cut the layout. Again cut the main layout into two pieces. One for rear and another for front panel of BT speaker.

Here's the dimensions (14*5*4cm)

Step 3: Making Holes

Picture of Making Holes

Take measurement of speaker's diameter and note down it. Draw holes exactly same size as speaker's diameter by using ruler and compass. Don't make bigger holes than speaker's diameter then speaker won't get fit on them.

Step 4: Cutting Holes

Picture of Cutting Holes

This is the most hardest part of this instructables. Take your rotary tool we'll start of by drilling a large hole inside the circular marking then sand of the excess plastic by using your sanding drum tip. Do the same process for passive radiator. But still I don't have any rotary tool that's why i used only hacksaw and sandpaper for the cut the holes.

Step 5: Making Side Panels

Picture of Making Side Panels

At first we'll give a temporary support between front & rear panels then we'll wrap both the panels by using masking tape, Next attach upper & lower panels with it. Then Soften the acrylic by heating it with a gas stove. after soften the acrylic quickly and carefully bend the acrylic. My neighbour's a little guy helped me a lot during bending the side panels. when i was holding the side panels at front of candle then he was blowing air at candle's flam through the pen straw.

Step 6: Mounting Speaker & Radiator

Picture of Mounting Speaker & Radiator

We're going to mount the speakers and passive radiator. we'll start by adding a thin layer of superglue around the edge of the speaker's hole. Once we add our layer of glue, flip the front panel, position it, and rest it on top of our speaker and hold it in place for several minutes. Again we'll repeat the same process for other speaker. After doing so, we'll use the same method to seal passive radiator. next apply a thin layer of hot glue around both the speakers and passive radiator to ensure that they are 100% airtight.

Step 7: Attach Lower Panel

Picture of Attach Lower Panel

I started off by sanding the lower panel, it necessary to remove the glossy finish, then superglue can join both the panels permanently. Next apply great amount of superglue on the edges of front panel and quickly position it to lower panel then hold it for couple of minutes. Finally add plenty of hot glue at the joint of two panels.

Step 8: Add Command Buttons

Picture of Add Command Buttons

Simply make hole corresponding the same size of your command buttons, also you can use your old recycled buttons. I'm using these buttons which I got from an old speaker. Next use a small piece of PCB board and solder all the buttons. Then add good amount of hot glue to fixed the buttons permanently.

Similarly add slide switch to the back panel.

Step 9: Add Slide Switch

Picture of Add Slide Switch

Simply make holes for switch by using your rotary tools, after doing this sand the holes perfectly, then install the switches and apply some amount of hot glue on the corner side of switches. you can see that I attached two switches in one place. you can also do this for better result.

Step 10: Hacking Bluetooth Module

Picture of Hacking Bluetooth Module

I'm using BK8000L Bluetooth module which provides high quality sound and compatibility. It has SBC audio decoding performance. Here is a problem while using it with PAM8403 amplifier board due the common GND, will have current noise. But how I used the PAM8403 amp board in this project. Don't worry, i'm unveiling the real story. I used two batteries in the place of one battery. one for amp board and another for BT module. when we'll use two batteries then we'll get differential GND and these won't effect each other. Thus it helps to eliminate sound noise and we can still work with PAM8403 amp without any problem.

I made an extension board to attach BT module for durability.I strongly recommended this cause if you use BT module without extension board then wires might not be solder well or comes out frequently.

Step 11: Soldering Speakers, Amplifier and Bluetooth Module

Picture of Soldering Speakers, Amplifier and Bluetooth Module

In this part we're going to install and connect the speakers, amplifier and Bluetooth module. At first we'll connect the wire to speakers VCC(+) and GND(-) carefully. Then we connect these wires to amplifier's L(Left channel) ,G(GND), R(Right channel). Next we just connect wire to VCC(+) and GND(-) of amp board. After that we'll connect wire between amplifier's L G R to BT module L G R connection [Note: BT Module has two negative output(LN and RN). So connect Both negative terminals for balanced stereo performance]. Then solder wire on functional buttons.

Step 12: Soldering Batteries and Charging Module

Picture of Soldering Batteries and Charging Module

here I'm using two batteries one for amp board and another for BT module. But you can easily say that how i'll charge these two batteries. after some research I got an idea. I'm using a slide switch to charge these two batteries separately. we can use this method for charging two batteries one by one without facing any problem. I recommend to use a charging module with battery protection inbuilt but you can use mobile battery, that already has a inbuilt protection board.

Step 13: Soldering Command Buttons

Picture of Soldering Command Buttons

Mount all the command buttons with 10k resistors on a PCB board, then solder wire.

Step 14: Making the Complete Circuit

Picture of Making the Complete Circuit

Now its time to make the complete circuit. You've to connect all the components carefully and exactly same as the circuit diagram showing.

Step 15: Mounting the Battery

Picture of Mounting the Battery

Apply hot glue on battery and quickly attach it to the back panel.

Step 16: Attach Back Panel

Picture of Attach Back Panel

After make complete circuit, Now we'll attach the back panel. first apply superglue around the edges of back panel and quickly position it, then still hold it for few minutes. after that apply enough amount of hot glue to make it 100% airtight.

Step 17: Sealing the Upper Panel

Picture of Sealing the Upper Panel

First solder command button's wire, then seal the upper panel by using superglue. Next press still for few minutes.

Step 18: Sanding the Edges & Surface

Picture of Sanding the Edges & Surface

At first cover speakers and passive radiator by masking tape. Use your rotary tool to grind off the sharp edges. Next sand the surface until you get the flat and smooth surface. It can take some time, but it necessary to fill the gapes.

Step 19: Paint Time (most Interesting Part:)

Picture of Paint Time (most Interesting Part:)

Paint your BT speaker with your favourite colours. I'm using here two colours matte black and Yellow. you choose yours. I also gave vertical and horizontal pattern for more attractive look. After painting it looks exactly same as my expectation.

Step 20: Finishing Ideas

Picture of Finishing Ideas

Add rubber feet to reduce vibration while place it to any flat surface. Customize your BT speaker with your creative ideas.

I really enjoyed a lot while I'm building this project. Make Your own BT speaker and show it to your friends, May be they also like to make their own and that's how we DIY maker can expand our community. Thanks for watching this. Again I'm requesting you guy's please vote me. Don't forget to follow me for upcoming projects.


rosegopy (author)2017-04-27

bro your project is very nice. pl provide link for passive radiator in India

you can also buy it from
They supply it to India, but it takes a month

Bro I didn't buy the passive radiator. I got it from my old speaker.

TanishqS5 (author)2017-07-28

can you tell me more clearly about the connection for the command buttons and i i guess i can use basic tactile push buttons instead of speaker buttons?

pawtanwar (author)2017-03-04

post a instructable on that third-hand you are using. :)

Ok bro I will try to post soon :)

pawtanwar (author)pawtanwar2017-03-04

What's the camera model you are using?

I used my Microsoft Lumia take all the photos

pj200 (author)2017-02-15

Very well explained and a highly detailed project

Surajit Majumdar (author)pj2002017-02-17

Thanks :)

spooky_sharad (author)2017-02-03

bro plz send me the clear wiring diagram

Ok bro I'll send you later

Steve Willson Kujur (author)2017-02-03

see my one

Woow it looks awesome :)

spooky_sharad (author)2017-01-31

Awesome one ...bro

Thanks bro

nice build. hey can you please provide links to all parts you used? if able. thanks

I bought every parts from eBay and some I got from local store.

isdubkov (author)2017-02-02

Hey! Nice build! Vote up!

Thanks isdubkov. It means a lot to me ?

Microbe (author)2017-02-02

+ vote for the clever idea of blowing the heat from a candle - I have travelled in India a couple of times and am constantly surprised by people's ingenuity.

Surajit Majumdar (author)Microbe2017-02-03

Thanks microbe. I'm glad that u like it :)

CurtR (author)2017-02-02

Good instructable. I tried to use this BT module but found it very difficult to solder the wires on to it. Here is a link to another BT module . Just remove the plastic case. Worked great for me.

Surajit Majumdar (author)CurtR2017-02-03

I used exactly same module at my previous Bluetooth speaker but it was producing noise.

You could try my method to solder wire on to Bluetooth module.

navinm1 (author)2017-02-02

how much would i have to spend on it?

Surajit Majumdar (author)navinm12017-02-03

Approximately $15

nurkob72 (author)2017-02-02

what is the black thing in between the two speakers?

It's called passive radiator/driver.

guicar (author)2017-02-02

How does this compare to your BBox?

Nice diy speaker :)

rexnanet (author)2017-02-02

You still have common ground.

And one of the batteries is not protected by the charger protection circuit (assuming it's the one on the picture)

yeah but it doesn't produce noise cause both module powered by different battery. one battery already has built in protection board. that's why I didn't connect it to battery projection board.

So is it a common ground that causes a problem, or a common power supply?

Which gets noisy? Does the amp push noise back on to the BT supply?

Can you just use a bunch of capacitors to quiet things out?

djuscha (author)2017-01-31

Great Work!!

Where did you buy the speakers?

Surajit Majumdar (author)djuscha2017-01-31

I got from my old bt speaker

About This Instructable




Bio: Hey Guys, My name is Surajit Majumdar. I'm from India. now I'm 19 years old, studying at college. Making diy project its my ... More »
More by Surajit Majumdar:DIY Portable And Powerful Bluetooth Speaker DIY Variable Power Supply With Adjustable Voltage and CurrentHow to Make a DIY Smartphone Controlled RC Car
Add instructable to: