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:
- aux input
- sd card support
- fm radio
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
CKT: Battery charging n protection circuit
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.
Step 10: Glue the Cloth on the Box and Feel the Rich Look of the Cheap Plastic Box:P
fic the speakers n the panel onto the box using some screws n you r almost done
Step 11: Time to Power-on and Dance on the Beats:P
Power it up n woahhhh!
Your speaker is readyto rock!
Any suggestions,questions,always welcome:)