This design is explicitly not open source. From the linked page: NO SCHEMATIC: Because YoYoDyne is taking considerable financial risk to produce an unproven DA

This design is explicitly not open source. From the linked page: NO SCHEMATIC: Because YoYoDyne is taking considerable financial risk to produce an unproven DAC in relatively high volume, it’s not reasonable to have it be open source (see the previous ODAC articles). Once he’s hopefully recovered his investment, we plan to re-visit the open source question. However, there are several other open source DACs available with plenty of documentation. One such example: http://www.amb.org/audio/gamma2/ http://www.amb.org/audio/gamma2/