Diy Portable Speakers With Bluetooth N Remote

Now in today's world everyone needs everything wireless.who likes mess of wires lying around here n there?

N this is why i decided to build this wireless battery powered portable bluetooth speakers which i can carry anywhere n connect to every possible device that i have.

Moreover,i have tried to keep the price of this item as low as possible by using/reusing some household items such that it can b made at lowest possible cost.

any suggestions or comments,always welcome:)

Step 1: Gather the Materials That U Wish to Use

Step 2: Select the Proper Box/enclosure That U Wish to Use for Your Project

here, i have used thie box,remove the plastic n u have a neat n clean plastic case for your diy speakers

Step 3: Selection of Power Source

Here,i have tried to select the lowest possible battery,such that it is lightweight and easily chargeable.Li-ions hold a lot of charge and are easily rechargeable.I have used this 3.7v battery so that i can use a 5v mobile charger to charge it anywhere using a usb charging cable.

Also i didnt want to carry any extra charger along with me whenever i go for outing in order to charge these speakers.So i preferred to use these batteries imstead of using a 12v battery

Step 4: Charging for the Battery(tp4056)

I have used this tp4056 li-ion charger which is a very good battery charger.u can charge li-ion or li-po cells using this module.it also has some protection features which are as follows

Over-current protection
Under-voltage protection
Over-voltage protection
Short-circuit protection

Step 5: Selection of Amplifier and Pre-amplifier

A variety of amplifier are available in the market which you can acutaly use.However i preferred to use a low voltage amplifier for m project.So i chose PAM8403 audio amplifier which is a 3w audio amplifier.It works very well at voltage range 2.5-5v

Also i chose a pre-amplifier that is working on the same voltage range as well.

The pre-amplifier that i have used has a lot of features which are as follows:

bluetooth
aux input
usb
sd card support
fm radio
remote

You can however use the pre-amplifier also of your choice depending upon the features that you wish to have;)

Step 6: Here Comes the Main Punch,the Speaker Drivers:P

Here i have used these speakers because they have a good punch of bass ,which i actually intended to have.You can however use any sort of speaker that you have

The speakers I've used are 4ohm 4watts and 4ohm 3watts respectively.

However you can use any speakers of your choice:)

Step 7: The Block Diagram

NOTE:the circuit diagram is quite obvious and easy to understnad

S1,S2,S3,S4: Speakers

A1,A2: Amplifier

BAT: Battery

CKT: Battery charging n protection circuit

S:Switch

Step 8: Bass Treble Circuit(Optional)

you can skip this step if you want.

I actually wanted a precise control over the sound of my speakers and so i decided to add this circuit

There are 4 trimmers as you can c in the picture.wiz bass treble for left and right channels.

Ive connected it in between the amp n the preamp

Step 9: Cutout for Putting All Insde the Box

Ive done all the cuttings using a very sharp knife by heating it up on a burner.

Heating is so that the plastic doesn't break of pressure n gets easily cut.

After all the holes were cut,i cut the cloth into pieces in size of the box and glued it using fevicol. You can use any thick adhesive of your choice.