This circuit is Headphone Amplifier using IC NE5532 , its ic usually using as OpAmp with very good performance. And we just using it for headphone amplifier. see this circuit diagram of it below complete with power supply schematic.
NE5532 Based Headphone Amplifier
This headphone amplifier schematic is a typical application schematic. Experiments show that the NE5532 for low-power amplifier, excellent performance and good price. Voltage supply about 12V DC assymetric.