USB DAC with amplifier

Found out today that support for USB audio peripherals was added in Android Lollipop. Tested the USB DAC with my Nexus 5 and it worked perfectly! The only downside is that a external power supply is needed when volume is increased.

Android USB Audio

I just finished soldering the components on the latest PCB. Did some testing and everything seems to work. Had some problems with the volume at first, it would change randomly when i got close to the PCB. I think a bad ground connection caused this. The USB-cable i used was very loose in the connector and when i changed the cable everything was fine.

Got the new PCB and some missing components for the new version today! Unfortunately i could only solder the USB connector before my almost new solder station broke, so now i must get a replacement before i can continue. 

Here is the new PCB compared to the old one.

The PCBs are now ordered from OSH park :)

The new PCB layout is soon ready :) Only some routing and adjustments left

I am almost done with the new schematic for the (hopefully) final version. The only thing left before i start with the PCB layout is to check all footprints and recheck all connections.