Diy 3D Printed Bluetooth Speakers From Old Earpods

Hello friends i hope you all doing fine i am sharing this instructables to show you how i utilized my old broken chinese earpods to make two independent codeless speakers so lets start this instructables i tried to keep everything as simple and cheap as possible. And one more thing is that i am not good in english so realise sorry if you may find out any weird sentence or wrong spellings but i wants to share this with you.

Supplies

I have used all the modular components which you will find easily on any online of offline stores and are really cheap.

*TP4056 li-ion battery charger (2 pcs ).

*PAM8403 amplifier module (2pcs).

*MT3608 boost convert module (2pcs).

*AMS1117 3.3voltage regulator ic (2pcs).

*Sprakers 4ohm 3w (2pcs) . I salvage theses sprakers from old lcd screen .

*18650 li-ion battery (2pcs).

*3D printed case (2pcs).

*2 micro switches and 2 power switches.

*some wires which you can salvage from old data cables.

*And one more important component is the earpods itself.

Step 1: Idea and Block Diagram

The whole idea is that i used a amplifier to increases the output power of the bluetooth receiver in order to drive a more powerful speaker so for that i use this configuration:-------------

lets further divide this whole step on no of sub steps so,

Solder the two wires from speakers to the left or right output channel of the PAM8403 amplifire if you are using left channel then the input is supplied to the left like i did and if you will use right channel then input must be given to the right input on the board.
solder the two wires on the TP4056 and then to the battery but dont forget to check + and - solder them correctly.
solder the two wires from the output of TP4056 to the battery.
now solder a power switch at TP4056 output which will turn on and off the chole circuit.
not solder the output of this power switch to the input of the boost convertor.
the most crucial step it to set 5v at the output of the boost convertor by using the potentiometer and a digital multi-meter.
not soldering the output of the boost convertor to the input of the PAM8403 amplifire board.

Step 2: Tearing Down the Earpods and Removing the Receiver

This is the most important step of the project because if you used too much force or did something unnecessary than the pcb of the earpod will get damage so be careful not to broke anything i put a video link of my youtube i you may find any difficulty in any step then you can watch my video.

Hence remove the receiver pcv from ear pods.

Step 3: Soldering the Micro Switch to the Receiver

i directly soldered the micro switch on the earpod receiver with two very soft wires first i removed the old onboard smd switch and replace it with by new one as you can seen in pic.

Step 4: Power Supply for Reveiver

Till now everything is pretty simple now problem begins now in know most of you are thinking why i am using a AMS1117 voltage regulator because earpods also uses the 3.8v battery and i am also using 18650 battery which is also outputs the same 3.8v so why i am not connecting it directly so friends i wants tell you i don't know what is going in whenever i try to connect the earpods directly to the 18650 battery with the whole circuit something weird is going on when ever i try to turn my receivers on they won't respond they won't turn on and start making weird noise i don't know why if any one of you now please let me know in the commect. so in order to avoid this problem i have to use any voltage convertor you can also use any buck convertor like mini 360 but i wants to reduce the cost.

Step 5: Connecting Receiver to the Amplifier

Now there are two sound output wires which outputs the sound signal since the ground is connected to the power supply as well as amplifier so we need to connect only +ve output to the amplifier now solder a wire from amplifier input to the reciever output and we are done with wiring.

Step 6: Putting Out Everything in the Box

Now lets divide this step in to sub steps too,

first glue the speaker in the case with the help of glue.
the secure the PAM8403 amplifier and MT3608 boost convertor in the box with the help of double sided tape.
not secure the receiver with the help of double sided tape
now glue the both switches on to the back of the cover as wall as the battery.
secure the TP4056 charging module with the hot glue or double sided tape in the box and we are done.
now screw down the bottom cover with the screws to the main body and we are ready to play.