This is a very simple USB amplifier with just three components and a speaker, it can be used as a mono headphone amplifier too, the input powersupply is 5v obtained from the used this system can b used for listening songs while travelling and this circuit can work from powerbanks too. the component costs are so less too.
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Step 1: Parts List
1 x common circuit board ( dot matrix board)
1 x 3.5 mm headphone socket
1 x 100uf electrolytic capacitor
1 x BC547 transistor
1 x 1K ohm resistor
Step 2: Circuit Diagram
complete the circuit according to the circuit diagram
Step 3: Conclusion
enjoy music all the way :), cheap and effective and can be made easily with very less components