Usb powered headphone Amp

After the successful build of my gaming amp i decided to try a usb powered headphone amp. So i came up with this design after having “reversed engenierd”  a cd rom which had cd playback capaility. i the added an input section. after acquiring the pdf datasheet for the ic i then added the usb power. after a few tries found out it needed a pull up resistor to unmute the circuit. here is a pic of the hacked up version.



After a couple hours of use i then took to make a schematic and pcb lay out and came up with some modifications that added a bit more low end and less noise all in all i love this amp more and i am planning on a mark2 for. guessed it gaming purposes. here is the schematic and pcb layout.



And heres  the pcb


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