The Graham Slee Bitzie DAC works with the Galaxy S3 - the sound quality is excellent and I recommend it highly
You need a cable that is micro USB (out from S3) to USB 'B' type (into Bitzie DAC). The Bitzie has a phono 'Y' output adaptor included in the packaging so you can connect to a main system via phono interconnects
In several countries there is a loan scheme to borrow the Bitzie before purchase (UK, Europe, USA, Australia etc)
It also acts as very high quality USB DAC between a computer (PC or MAC) and main system. There is a high quality USB 'B' - 'A' cable for this purpose which can be ordered as a standard option
You need a cable that is micro USB (out from S3) to USB 'B' type (into Bitzie DAC). The Bitzie has a phono 'Y' output adaptor included in the packaging so you can connect to a main system via phono interconnects
In several countries there is a loan scheme to borrow the Bitzie before purchase (UK, Europe, USA, Australia etc)
It also acts as very high quality USB DAC between a computer (PC or MAC) and main system. There is a high quality USB 'B' - 'A' cable for this purpose which can be ordered as a standard option