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Usually is a stereo system equipped with a under moderate headphone amplifier, if any exist at all? The source of the sound is mostly from the same connection as the speakers use. Quite often, signal and noise ratio is bad and the noise is audible. In addition, it can be nice to be able to adjust the volume for speakers and headphones separately. It can also be a surprise to be hit by a violent sound volume, if you happen to unplug the headphones under a listening. This headphone amplifier is built of discrete components and can be designed in many ways. You can choose to build it into a stereo amplifier or allow it to stand next to your stereo. I have used this unit for years and it still works fine. 
If you want to look closer on this thing you can download it here: In the zip-file can you find everything required to implement it (manuals, diagrams and PCB-files)
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