Haven’t had time to test it fully yet, but these boards arrived early this morning.
UPDATE: These work wonderfully well. I’m using two (one for each universe) in my display this year.
It’s an 8-way somewhat-isolated DMX splitter.
DMX in & through on XLR-5 jacks. DMX in section is fully isolated from the rest of the world.
8 RS-485 drivers in parallel with pinheader (.1″) outputs. These outputs are *not* isolated from each other, but each does contain a discrete driver chip. A proper opto-splitter design would have each output powered by it’s own DC power supply and isolated from its neighbors with an optocoupler. To get an isolated DC power supply, use a small DC-DC converter per channel or a small AC transformer + regulator per channel.
Expensive and complicated, but very safe.
I skipped the added isolation because my rig was all being powered from a single power supply and all gear was connected to a single AC outlet. Your mileage may vary, of course.
I’m using these to route my rooftop data lines, but ran about 20 extra boards in case anyone else was interested. $5 each, and I’ll send you the full schematic and parts list.