This headphone class A amplifier circuit can be close to perfect as a headphone amplifier with sound quality that can be relied upon. The headphone amplifier average does not require a great power, it may be about 1 to 2 Watt.
This headphone class A amplifier circuit suitable for use in headphone impedance 32 ohms, 600 ohms, and 2kohm. This amplifier will ensure an amazing sound quality because working in class A.
Although work on the class A, the transistors Q5 and Q6 only requires a small piece of heatsink. Power supply required for this headphone amplifier is a symmetrical voltage of +/- 15V with a current of 100mA for single channel. If you are going to build a stereo system, it would require current of 200 mA so that the headphone class A amplifier circuit is working optimally.