Portable Bluetooth Speaker 2x3W Finished !




About: Industrial Engineer

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.

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Step 1: 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

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

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

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

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

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320 Discussions


4 years ago on Introduction

....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.

10 replies

Reply 4 years ago

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


Reply 4 years ago

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 ! :)


Reply 4 years ago on Introduction

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


Reply 4 years ago

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 :)

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.


4 years ago

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

1 reply

Question 1 year ago

I want to ask,

what is that ?


Question 1 year ago

I want to ask,
How many volt capacitors are needed?


1 year ago

Any way to get a parts list without using Adfly?

Jared Scott

2 years ago

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

Jared Scott

2 years ago

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