First, watch the video till its end then you will understand everything.
Step 1: Circuit Diagram
Here is the circuit diagram guys.
you can also make it by joining some simple components.
sound Quality is Desert at low Number of the components.
Step 2: Here Is a Picture While Playing
Here are some essential Link:
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Needed Components Online Link-
1. N-Channel MOSFET
IRF840B (I used this in this article)
3. 3.5mm Headphone Jack
5. 2.2k 1/4w Resistor
6. 1uf Capacitor
7. 18650 Battery
9. Heat Shrink Tube
**Note: Use Heat shrink tube for making all connections Secure.