I am planning to use the 4th Universe from one of my E681s for my DMX output to the yard. And my DMX channels are entirely comprised the little 3 Channel China controllers from Holiday Coro (currently 18 of them) but may grow to 30 before the "lights come on."
I am concerned about having my E681 running with a fairly large 150W 12V power supply .. and then directly driving the DMX output to all the China controllers. Therefore, I am thinking it would be smart to put a DMX Opto-Isolater repeater on the E681 DMX output. This would assure any electrical surges would not traverse either way between my DMX and my E681 pixels.
I am looking for comments on DMX isolators if anyone has experience with them. I know that some of them can get quite expensive (even over $200) .. If I wanted to spend that much I could have purchased the ENTTEC Pro ... except I don't want any more USB interfaces! LOR will be on the USB :-)
Here's one in the $40 range on eBay.
Is this a good idea or a bad idea ? Does anyone know of DMX isolators for a better deal ? Maybe a group buy?