A good headphone amplifier will provide you with unlimited hours of excellent musical pleasure. With a good pair of headphones, you will be able to hear even th emost subtle details in your favorite songs. Alas,many modern entertainment equipment comes with very poor headphine amplifiers, so it is a good plan to build your own high quality headphine amplifiers exactly to your needs.
Here are some links to interesting Headphone amplifier circuits

Here you may find Circuit, Basics, Schematic Diagram and components for Headphone Amplifier

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