On Android phones that support USB-OTG (most of the better&#x2F;more modern ones) you can literally just plug a standard USB DAC into the onboard USB port. Honestly, it shouldn&#x27;t be that hard to just include a decent onboard DAC and headphone amp these days though - Sandisk&#x27;s MP3 players and Allwinner&#x27;s range of ARM SoCs have even managed to integrate both on the same die as the main CPU no problem.