Florian Wolters made his own version of MMDVM adapter:
During experiments with digital voice mode in hamradio I discovered a nice project describing an adapter for D-Star, DMR and other digital modes based on an Arduino Due and a little PCB to be put on top. This unit is called the Multimode Digital Voice Modem or MMDVM (see [1]). It seems that this is getting quite popular because hard- and software is Open Source.
Check out the video after the break.
Is my eyes playing tricks on me or did he just use gobs and gobs of solder on the top side?