Introduction: Portable Bluetooth Speaker 2x3W Finished !

Picture of Portable Bluetooth Speaker 2x3W Finished !

Bluetooth Speaker

Make your own loud Bluetooth Speaker easy explained, cheap and handy to use for less then 14$.

Maybe you have some components which you don't need to buy like 3W speakers to make it less expensive.

In the following steps I will try to explain on the easiest way how to assemble this bluetooth speaker, people who don't know a lot of electronics will understand I hope, because I didn't know a lot about speakers,amplifiers and bluetooth stuff before making this speaker.

This speaker has a long battery life when you use good 18650 lithium batteries.

I found 3x 18650 lithium batteries which I used in parallel and has a total of 6600mah, the speaker plays 22 hours on the highest volume which is very loud.

You can charge the speaker with a micro USB, which is very handy!

In the next video I will show you the finished speaker and play a song to show you.

Step 1: Collect the Parts You Need

Picture of Collect the Parts You Need

Collect the parts

What do you need?

- Bluetooth Stereo Audio Module:Ebay

If you wanna use a more easy and cheaper way, choose for the bluetooth audio USB, Very easy to connect and longer bluetooth distance! Check my other instructable were I used the bluetooth usb for the connections ;)

- Micro usb Charger module 5V 1A:Ebay

If you want a undervoltage protection to you can use this Micro usb protected charging module.

Check my other instructable were I used this protected charging module for the connections ;)

- 2x3W Amplifier:Ebay

I Should really recommand THIS Amplifier if you use a bluetooth audio USB, after I building it with the normal one I deccided to add a volume switch because the bluetooth usb has a very loud startup sound!

- 2 Speakers 3W 4Ω:Ebay

These speakers had good reviews and the sound is very good for there size!

or Ebay -> These are 8Ω 3W speakers which will sound more clear then 4Ω but not that loud.

- 3.7V Lithium 18650 Battery:NKON

I found my lithium battery in a router/modem, you can easy find them in laptop batteries, the battery of a drill or other electrical stuff. You just need a 3.7V Lithium Battery (You can also buy them on the internet)

I would really recommend to search very good after these because they aren't cheap

- Capacitor: 100µF capacitor

- Small wires and a switch

Step 2: Put the Parts Together

Picture of Put the Parts Together

Put the parts together

Connect the parts with wires which you can see in the picture.

It's easy to glue the bluetooth module to a circuit board to make it stronger because otherwise the wires will snap from the module I guess.

You can also add buttons on the bluetooth module to change volume, pauze or play a song and go to the next song, but I didn't do that in my bluetooth speaker.

In the next video, I will do a quick test of the speaker with a voltage source instead of a battery, but it works the same. Also watch my video below where I play a song when the speaker is totally finished ! :)

Step 3: Put Everything in the Cover

Picture of Put Everything in the Cover

Here are some pictures during the assemblage of the speaker.

First I wanted to make the cover out of wood, this would give you an excellent audio quality.

After a while I decided to put the speakers into a pvc T-profile with a diametre of 50mm.

It's much more easy to make and it looks original to me :)

It is very compact and it sounds great You can find the T-profiles in your local store which costs only 2$ or on the internet.

Step 4: Giving the Final Touch to the Speaker

Picture of Giving the Final Touch to the Speaker

I also putted a grill on it to protect the speaker.

Thanks to my friend Robbe Derks who helped me a lot !!!


hobbyman (author)2015-04-05

....looks great. even nicer than a finished many market products. T profile is really good choice. There might be some nice and easy way to protect the speaker from sharp objects outside.

bartroosen (author)hobbyman2015-04-05

Thanks :) that's a good idea to protect them !

JesseD3 (author)bartroosen2015-04-06

Did u have noise without the 100uF cap? Or how did u decide on that cap?

bartroosen (author)JesseD32015-04-07

I haven't tested without the cap but in the datasheet they said to use a 47uF and I really don't know what the difference should be.
I have a little beep tone in the background maybe it's cause the cap maybe not I you can test it would you pls tell me or there's a big difference ?
Thanks ! :)

ErikSteef (author)bartroosen2015-04-09

I read somewhere that when the Powerlevel of the Bluetooth module becomes below 3.3Volts it introduces a 800Hz tone

bartroosen (author)ErikSteef2015-04-09

Oooh Thanks,
Maybe my batteries are just to low at the moment xD
Thanks man, I will charge them and say or the beep tone in the background dissapeared ;) I've only charged them once until now, the batteries inside are very good, better then I expected :)

Did you still experience the tone after charging? Did you try a different cap?

I didn t try a different cap, but after charging the tone is stil there :-)

lutkeveld (author)bartroosen2015-04-07

It's used for decoupling, good practice to keep it in there.

bartroosen (author)lutkeveld2015-04-08

Oh Thanks lutkeveld good to know!

gregjd5000 (author)bartroosen2015-04-07

A capacitor on the power line can reduce ripples in voltage from the change from a big draw when the speaker is being pushed or pulled to no draw (in current) when the speaker is in between. The choice of capacitor determines the frequency it helps with. Replacing 47uF with 100uF sometimes will not make any noticeable difference but sometimes will. If you hear annoying tones then maybe you have to change it back.

mkramer4 (author)2015-04-05

This is amazing. I am gonna try this for sure thanks for the instuctable

bartroosen (author)mkramer42015-04-05

Thanks !

nicholsgerald (author)2017-12-09

Any way to get a parts list without using Adfly?

Jared Scott (author)2017-02-10

What did you use to encase the speakers and electrical work, is it a piece of PVC pipe? What size?

Jared Scott (author)2017-02-10

What did you use to shell the speakers in. PVC pipe? If so what size piece?

Dlemas (author)2017-01-28

Any chance I can share my layout before I start to get feedback? This will be my first electronics project and I want to ensure I have the correct connections. I can send a power point slide with my layout.

JosD12 (author)2016-12-21


I am using pam8403 module to drive two 4ohm 3watt speakers using a 2200mAh Li-ion battery but when I increase the volume around 75 to 80% on my phone the sound starts to cut off (speaker cones move in and out extremely during the time),and when I increase the volume further it becomes worse and sounds p p p pp ppp p ppp p p... I cannot understand what is the problem, could it be because there is no enough current ?,I also tried a 2 amp 5v dc input from a fast charger of my phone but same is the case

please help me with this.

Poljo86 (author)2016-05-27

Hi..great project :) I wanna use bluetooth audio usb,can you put scheme about connecting wires on that bluetooth?? Thank you

bartroosen (author)Poljo862016-11-24

In my other bluetooth speaker I have used a audio usb so it's explained there already ;)

Goldie84 (author)2016-09-15

I like the coloured bands, but can't see what they are. Are they just wrist bands?

Thanks for the great project!

bartroosen (author)Goldie842016-11-24

Yep they are just rubber wrist bands ;)

ВладимирШ11 (author)2016-10-21

Perfectly. Thank you for publishing.


At first it was mono. Then there was the stereo. And thanks to technology again returned to mono.

Really supports stereo speaker. But the distance is too small.

How to make two different speaker? One for the left channel. Another one for the right channel. Then we can put them far from each other. And it will be a great stereo.

oussama10 (author)2016-09-15

how is help me to send the report

jsgraham (author)2016-07-03

Please update the links to your parts list. Adfly is requiring people to sign up for an account just to follow your links.

ClaytonO2 (author)2016-06-12

All of the links you posted go to adfly instead of ebay etc. Any chance you could update those links? Thanks!

isabelt4 (author)2016-04-16

i charged the battery and it over heated made a short sound...what am i doing wrong?

isabelt4 (author)isabelt42016-04-16


argentof made it! (author)2016-03-13

Hi. I maid a little bit different speaker hahaha, thank you for make this instructable! Tip: the black thing right there is from another speaker and help making the music sound better

aleko205 (author)2016-02-24

Hello, I bought exactly this model bluetooth and audio amplifier (PAM8403). Bluetooth have good quality sound but amplifier has a bad noise, this noise is too high than music level. What can I do? I tried work with only battery, tried stabilisation with capacitor but noise is still :(.

aleko205 (author)2016-02-14

Hi, which is small size best quality bluetooth module? I would like install it in Belkin cassette, or module which will be big size and will work with 12v. I will install in in car's old audio system.

Airborne. (author)2016-01-02

hi, i have a very ennoying piiiii sound. i hear it mostly when there is a quiet part in the song, i don't have any capacitors in the circuit. i was wondering if the capacitor is capable of removing that ennoying sound. i have tested everything and the problem only occurs when the bluetooth is connected to the same battery. i dont want to use 2 seperate batteries in my bluetooth speaker. I even tried it with a 5v battery and the same problem occurs. does anyone know how i could fix this problem? thanks in advance

bartroosen (author)Airborne.2016-01-02

Hi, That sounds familiar.

I have also a quiet beep tone but I doesn't botter me.

If you want that the beep is completely gone you can use a groundloop isolator.

Just put it between you audio L R Ground signal and it will filter the beep out of it.

Airborne. (author)bartroosen2016-01-02

Thanks, i will try it

parkerirby (author)2015-11-15

how did you attach the wires to the amp

bartroosen (author)parkerirby2015-12-18


IvanLau0708 (author)bartroosen2015-12-19

how to add volume button?and where to get it?can you give me a datasheet with the volume button installed?

makerbot1 (author)2015-11-12

Excellent tutorial! I bought most of my parts earlier this summer, and am about to put this thing together.

My only question so far is whether I need 2 or 3 of the batteries. I only recall needing two when I bought them, but I'm looking closer at your diagram and see you said you had 3 in parallel.


bartroosen (author)makerbot12015-11-13

Well first I had 3 2200mah batteries inside.
After a while I found some other 1500mah batteries and I wanted to keep the 2200mah batteries for another project.
I opened the speaker again and switched them.
So now actually I have 2 x 1500mah = 3000mah which is enough to play for 12h so I didn't need the big capacity of 6600mah.
I should recommand 2 batteries from NKON 2250mah which makes 4500mah which will play like 20h continue.
And maybe more it depends on the volume so this is calculated on the loudest volume :)

makerbot1 (author)bartroosen2015-12-17

Thanks so much. One more thing. Do you have tips on soldering the wires onto the circuit board with the connectors on the edge? I just don't want the solder to bleed into the next connection and mess up my circuit.

ChrisJ41 (author)2015-12-02

Has anyone else had problems with the XS3868 module cutting off too soon? Mine cuts off at 3.7V at very low volume.

yaerokhov11 made it! (author)2015-10-22

Hi! I have got problems with it...speakers work great, but microphone and buttons doesn't. Couldn't understand what's wrong with it.

bartroosen (author)yaerokhov112015-10-22

Hi great work!
Did you check the datasheet of your module just to be sure of the connections?
The picture I posted of mine module can be different of yours.
Just search you version and module datasheet andyou will find the correct connections ;)

yaerokhov11 made it! (author)bartroosen2015-10-31

My supplier gave me wrong datasheet(((

Can I connect buttons like this?

yaerokhov11 (author)bartroosen2015-10-22

I asked the data sheet from supplier). My module has ver 3.0.
what's 35 (rst) pin? Why you connect it with 33 (1,8v out)? With what shall I connect the button?

MayurY1 (author)2015-10-10

is its bass good ?

bartroosen (author)MayurY12015-10-27

Pretty good when you see the size of it :)

parkerirby (author)2015-10-08

Could you add a picture that shows how you wire in the battery and the switch, i am very confused on how to do it right

adrianov (author)2015-10-02

Great project and nice post!! I made it and it works but I have a little problem, when I reproduce music with it I hear a codification noise in background. Do you know how can I remove it?

bartroosen (author)adrianov2015-10-03

thanks man!
Yeah that's the little "bug" I have to
It's because the batterie is powering the amp and the bluetooth module.
When you use 2 seperate batteries for each the noise will be gone but it's not that easy to charge the 2 batteries, or you will need 2 charger modules.
also make sure you not cover the bluetooth chip. When you cover it, the range will decrease a lot ;)

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