Here is TH Custom's "Balanced Line Driver", that can be added to any pedal in order to get a balanced line output via XLR.
Or it can be built as a standalone unit, like I intend to do...
It is not a full D.I.Box design, but something close, intended for guitar/bass signals.
Cool thing is that it runs of a standard +9v supply instead of 48v phantom power.
It also has protection from 48v phantom power at the XLR end, so that a 48v feed from a mixer does not fry it.
I've looked over it a couple of times, and it seems ok, but it is not built and verified yet.
All TH Custom boards, there was no vero layout at the time. If there was I would have given it a try.
I mostly use these together with a buffered splitter and a cab sim board. The idea was to split the signal, one going to a guitar amp, the other through the cab sim board into the balanced driver and then into a mixing desk. Kinda like a Red Box.