8 Way DMX Splitter

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.  

8 Way DMX Splitter
8 Way DMX Splitter

5 Replies to “8 Way DMX Splitter”

  1. Hey, these look interesting, can they be used for general dmx splitting purposes as well or just for pixel use? Also, what form of binding posts/etc are you using for the output on these? Lastly what is the estimated cost once populated for each splitter? Id be interested in at least 4 if any are still available, thanks, Mike

  2. The boards will work with anything that speaks DMX, so the sky’s the limit.

    Outputs are on .1″ headers. For Christmas, I just soldered my wires directly in to the holes, but it’s easy to add a Molex / C-Grid .1″ crimp connector + locking header if you’re so inclined.

    I’ve got lots left. Price for a full kit of parts would be ~ $22 if memory serves. It’s a pretty economical design.

    I’ve also got stacks of XLR-5 M and F PC mount jacks if you need any. $4 each.


  3. Yes, there’s still a dozen (?) bare boards here in the shop. Email john at this domain for details.

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