i dont actually know what kind of head phones is this but when i plug it directly to my mp3 player, it has actually good/loud sound.. is there anything wrong with the circuit?
Your amp is running from a 3 volt supply, I think 9 volts is better.
Your amp has a 2.2k ohm resistor to limit the power to the headphones.
The amp you built applies a DC current to the headphones.
The 2.2k resistor in series with the headphones reduces the volume a little for 600 ohm headphones and a lot for low impedance headphones. It is not an amplifier, it is an attenuator.
The extremely simple circuit puts DC through the headphones that is bad.
i dont actually know what kind of head phones is this but when i plug it directly to my mp3 player, it has actually good/loud sound.. is there anything wrong with the circuit?
The 2.2k resistor in series with the headphones reduces the volume a little for 600 ohm headphones and a lot for low impedance headphones. It is not an amplifier, it is an attenuator.
The extremely simple circuit puts DC through the headphones that is bad.