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. ..you guessed it gaming purposes. here is the schematic and pcb layout.
And heres the pcb