This my fist project with SMD circuit. I ignored SMD because the small sized parts are confused me. The circuit of current SMD project is the headphone amplifier with TPA6120.
Step 1: Design Schematic and Footprint
Step 2: Design Variations of PCB for Prototypes
I designer 3 versions of PCBs to see the differences between the features of TPA6120. The output jack and volume potentiometer included to the first and second versions only. These boards are bigger than the 3rd, but in the last version I have input headers for balanced sources and separated power supplies to measure the benefits of these features. This is the reason why the volume pot missing from this board. I wonder, how better with balanced input and with separated power supply. My blogpost about this idea: