Portable Headphone Amplifier
Here is a portable headphone amplifier for your music player. This circuit improve the gadget audio outputs with low noise and distortion, as well as a long battery life. With an external amplifier, the headphone driver in the music player is no longer required to supply high currents into a low impedance.
This circuit project using four IC as the active components. 74HC14, 74HC74, OP462, MAX4410. And other active components are DMP2215L.
Component Side Layout
PCB Side Layout
[source:SiliconChip]