Introduction: Powerful Portable Bluetooth Speaker 2x5W

Picture of Powerful Portable Bluetooth Speaker 2x5W

Bluetooth Speaker

Make your own powerfull Bluetooth Speaker with some extra features, easy explained, cheap and handy to use for less then 15$.

Maybe you have some components which you don't need to buy like 5W speakers and some lithium batteries to make it less expensive like I did.

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 :)

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

I found 4x 18650 lithium batteries which I used in parallel and has a total of 6000mah, the speaker plays over 24 hours on the highest volume which is very loud.

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

I also added a voltmeter display wich I bought on ebay so I will know when the batteries are almost empty.

The last new thing I added to the speaker is the 5V usb out so you can charge your smartphone or other stuff.

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

What do you need?

- Bluetooth audio usb:Ebay

- Micro usb charger module(with protection):Ebay

I bought 2 of these just because they are very usefull.

- 5V usb output:Ebay

- 2x5W amplifier:Ebay

I should really recommand THIS Amplifier, 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!

If you want to add a single speaker you can use a mono amplifier (or buy a 5w mono amplifier)

- 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.

- 3 position switch:Ebay

The one I used did I find from an old toy

- 2 Speakers 5W:Ebay

Again i found mine in some old pc speakers

- Rubber (or passive radiators)

- Wires

- Material to make a box

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.

You need to dissasemble the bluetooth usb first and solder it like I showed in the picture.

It doesn't matter or the bluetooth usb gets 5V or 3.7V, it will work both.

Something I forgot to add in the schema is the V-meter display, just connect it to the + and - of the lithium batteries.

I used a 3 position switch, position1 is aux input and position2 is bluetooth mode.

Step 3: Put Everything in a Box

Picture of Put Everything in a Box

Here are some pictures during the assemblage of the speaker.

I made the box out of wood, this would give you an excellent audio quality.

I didn't bought passive radiators but found some rubber and I tried to make it by myself.

Step 4: Give the Final Touch to the Speaker

Picture of Give the Final Touch to the Speaker

I need to put a grill in front of the speakers, but I like it more without them to make pictures to post :)

If you have any questions, feel free to ask anything!


gary974 (author)2017-10-17


Sorry i'am french

is it possible with all bluetooth dongles or those that make audio?


viniebaby (author)2016-09-24

@afiqr6 the picture of the center speaker I added a pbuetooth module to! Perfect size, EASY to upgrade and cheap!

afiqr6 (author)2016-08-23

can i take a speaker and upgrade it with add a bluetooth...

viniebaby (author)afiqr62016-09-24

Yes you can! I found an old center speaker for a surround sound that looked ok and added my own speakers and a Bluetooth amp. Not yet portable but sounds amazing. :-)

viniebaby made it! (author)2016-07-07

I MADE IT!!!! HAHA!! The only thing is, I get background noise.. I tried putting ALL the grounds together but no go.. So ordered the isolator thing. Also, when I have the music placing via bluetooth and try to charge my phone at the same time, the bluetooth module dies.. :(What can I do with this? And also, can I use a simple on off toggle switch? I dont think I want to use a 3.5 in. Thank you!

PaulB151 (author)viniebaby2016-09-23

have you found anything for the background noise already? i'm having the same problem.

viniebaby (author)PaulB1512016-09-23

hey, yes I found a group loop isolator off eBay and worked perfectly! Now I got an issue there the batteries I got had protection on them so have to wait till I get non protected batteries :-/

PaulB151 (author)viniebaby2016-09-24

can you send me the link for the ebay ground loop isolator?

viniebaby (author)PaulB1512016-09-24

viniebaby (author)PaulB1512016-09-23


ckarelaid (author)2016-06-26


can you tell me the size of the box?
and would these speakers work too with this setup?

boompjes (author)2016-06-23

Hoi, mijn speakers werken! Blijkt dus dat de charging module kapot was. Denk dat ik met het solderen de chip heb doorgebrand. Voordat ik de case ga bouwen had ik nog iets cools gevonden wat ik er bij zou willen bouwen. Ik heb alles aangesloten zoals het hoort volgens die instructable. Maar het werkt niet. De transistor heeft 0.7V ongeveer nodig om aan te gaan. Als ik gewoon de Aux aansluiting van mijn mobiel aansluit gaat het licht niet aan. Herna heb ik gemeten hoeveel volt er op de aux staat. Zegt het 0 volt. Maar het geluid werkt wel. Als ik de bluetooth module aanzet staat er altijd 0.7V op de Aux en staat de led dus ook aan. Maar het voltage verandert niet dus weergeeft het ook geen ritme. Hopelijk kan je mij hier mee helpen.

De instructable:

Bedankt voor de mooie instructable Bartroosen!

boompjes (author)boompjes 2016-06-25

Het is me al gelukt! Ik moest 2 10K resistors plaatsen en een 10 uF condensator. Want de aux singaal was te zwak.

pegl12 (author)2016-06-19

Hey bartroosen im thinking of making a bluetooth speaker but i need some help, can the charger support 4 batteries? and im thinking to buy 2 2*3w amp and 1 bluetooth, if the bluetooth is 5v do i need a step up converter ? and if the amps are 5v do i need a step up converter? sorry for bad english

Devesh Parashar (author)2016-06-08

How do the rubber passive radiator alternatives perform?

Is the low end improved?

swaldo (author)Devesh Parashar2016-06-13

its hard to tell from mic from sounds good.Radiator driver's are tricky they work best with speakers that have a excursion.Radiator drivers work off the pressure inside the box more pressure the more they move also the box has to be completely sealed.I will tell you this there are some that are Garbage out there all they are is a steel plate with some rubber around them. Personally I like the ones you screw down because you can put a thin piece of weather striping on it and screw it down for a good seal.Parts express sells some cheap 10.00 speakers that are full range 3 in they have a dull gold face.i believe but I'm not fully sure I think there tang band. they also sell some radiator drivers they have a high excursion 6.5 that works real nice with 4 4 inch tang band speakers.the picture below is the what those 3 inch 10.00 speakers look like. put them in a small box with a 4 inch radiator driver in it and unbelievable for how small and the sound for the price.

swaldo (author)2015-08-31

here are examples with radiator driver facing down

Devesh Parashar (author)swaldo2016-06-08

You should do an instructable for this.

Devesh Parashar (author)swaldo2016-06-08

You should do an instructable for this.

bartroosen (author)swaldo2015-08-31

Woow thanks that's looking awesome!
Thanks for the idea!

MrTerminator98 (author)2016-05-04

got the protection board etc charging point and amp but where to put the bleutooth board?

bartroosen made it! (author)MrTerminator982016-05-05

I marked the 2 things on the board you need to connect. The 11.1V power and the audio signal output wich you need to connect to the amp.

MrTerminator98 (author)2016-05-02

i want to do this with 2 8 ohm 20w speakers, is this possible with the same setup or with another amp? thanks

You should use a more powerfull amplifier which runs on like 12V ,or 3 lithium batteries in serie which will give 11.1V.

If you want more info for making it with this amplifier just ask me I can show you how to wire it, because you also need a 3S protection board and a charger.

if you could explain that to me i can build it with the 20w speakers :)

bartroosen made it! (author)MrTerminator982016-05-04

These are the parts you need, the amplifier, charger, and protection borad for the lithium cells

If you want bluetooth to, buy this one

very good one with a wide voltage range 3.6-30V so 11.1V wil be good to power it ;)

CDaven88 (author)2016-03-24

I was wanting to do this with some 10w speakers I have laying around, would they work or would I need a better power supply?

bartroosen (author)CDaven882016-05-01

Of course they will work ;) I have tested the aplifier with 4ohm 10W speakers and still very loud and good sound.

majk g (author)2016-04-24

Please help
overheats my amplifier until until it shuts down

ChrisJ41 (author)2016-03-20

I used a USB Bluetooth module in another project. I found that the output jack ground was not DC ground but had a DC voltage on it. Was your USB Bluetooth this way? I used only DC ground for power and signal. I'm also wondering if the 5V step-up module eliminated the Bluetooth noise? What program did you use to draw the wiring diagrams with pictures. I would like to do my instructable the same way.

bartroosen (author)ChrisJ412016-03-21

Hi well I really don't know but I think the ground has no voltage?
If you really want no background noise you can put a ground isolator bewteen the bluetooth and the amplifier.

ChrisJ41 (author)bartroosen2016-03-21

Your USB Bluetooth receiver looks different. Mine does have a voltage on the output jack common. I think it is .9V which shouldn't be shorted to ground. It seems to get a good signal ground through the negative power lead so only 4 wires are connected. This is in a CD boombox. I silenced the noise completely with the 2 capacitors shown and a 1 ohm resistor on the positive lead. The black component between the capacitors is a diode. This receiver will work from 3.7V if it is connected to the side of that diode where the 470µf capacitor is but I don't know what that does to the noise.

moriang98 (author)2016-03-13

Quick question. How do I get the Bluetooth portion of this to work?

bartroosen (author)moriang982016-03-14

the bluetooth module needs 5V so you use the voltage which comes out the 5V usb output.
Watch the schema and everything will become clear ;)

moriang98 (author)2016-03-13

And also like asked before, how can I get the usb module to be able to charge my smartphone? I'm sorry I don't speak your language :(

bartroosen (author)moriang982016-03-14

Hi I have mentioned all the parts above with their links to buy them, inclusive the 1-5V to 5V usb converter

sandyh34 (author)2016-03-11

i want to make this one
but i dont know how to make a speaker powered from 2 power
direct from mini usb and the battery
can you help me ?

boompjes (author)2016-03-09

Hey, when connecting the batteries to B+ and B- on the charging board, the OUT + and - don't get any voltage. How come? When i put my charger in the board out does get voltage but it turns off and on very fast.
So the bluetooth module can't start. But only using the aux in-output does work without turning the bluetooth module on.

Ik dacht ik doe het maar in het engels misschien heeft iemand anders er ook wat aan.

bartroosen (author)boompjes 2016-03-09


Ik weet het nie helemaal zeker maar ik denk dat het aan de batterij ligt.
Is het een nieuwe lithium die je gebruikt of niet?
Zoals ik hoor lijkt het erop alsof je batterij stuk is dus onder de 2,5V geweest is.
Eens onder deze spanning zijn ze kappot je krijgt er nog wel spanning uit maar gaag zeer snel leeg en je kan er bijna geen stroom uithalen en de spanning zal drastish dalen.
zoniet ligt het aan die charging module ;)

boompjes (author)bartroosen2016-03-09

Huh, ik had deze batterijen bij NKON gekocht en ze zijn nog helemaal vol. Maakt het uit als ik de batterij direct aan de kabels aansluit die bij out zan aangesloten?

bartroosen (author)boompjes 2016-03-10

dus gewoon B+ en B- de batterij aan hangen en OUT+ en OUT- naar alle verbruikers gaan zoals in het schema

boompjes (author)bartroosen2016-03-10

Ja precies zoals jij het zegt, ik ga morgen weer ff kijken met de multimeter hoe het nou precies zit. Een vraag als ik de oplader niet insteek en de batterij op B+ en B- aansluit dan zou OUT toch spanning moeten krijgen.

bartroosen (author)boompjes 2016-03-11

ja normaal zou dan uit OUT dezelfde spanning moeten komen als de batterij geeft.

bartroosen (author)boompjes 2016-03-10

Bedoel je dat je B+ en OUT+ met elkaar verbind en hetzelfde met B- en OUT- ? want dat mag echt niet.
OUT zorgt ervoor dat de batterij niet boven de 4,2V en onder de 3,2V zou geraken voor schade aan de batterij te voorkomen. dus nooit aan elkaar hangen

boompjes (author)bartroosen2016-03-10

Goed om te weten. Weet je al hoe het komt dat als ik mijn oplader er in stop dat out dan spanning krijgt en dan om de milliseconden weer uit en aan gaat? Dat is de rede waarom de bleutooth het vlgns mij niet doet

bartroosen (author)boompjes 2016-03-10

Ja komt dat niet omdat die je die OUT en B verkeerd aangesloten hebt ?

RicardoT20 (author)2016-02-20

What are the passive radiators for?

bartroosen (author)RicardoT202016-02-27

They will be used to create more bass. To get the best result, there might not escape any air out of the box so the passive radiator will move in the opposite direction as the speaker.

RicardoT20 (author)bartroosen2016-03-01

Thank you. I will post picture of end product. Once again thank you.

JeetH2 (author)2016-02-25

I found a pair of Phillips 8 ohm speakers. I dont know other specifications about it so which amplifier to use. Kindly help

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