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Original thread:
Post 9 made on Wednesday December 26, 2018 at 19:54
Ernie Gilman
Yes, That Ernie!
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December 2001
30,104
On December 26, 2018 at 13:16, Fins said...
First, for the readers, let’s clarrify that there is actually only one emitter being used. It has dual 3.5mm male plugs. I didn’t know these existed.

That's my fault. I didn't check the model number (chagrin) to realize that this is two feeds to one LED, and it sounded like he was talking about two LEDs. And then, wrong, I went from there....

A crucial thing about the actual product is that the two inputs share a common ground. If the AMX and the Xantech system have no ground interconnection, fine. If their grounds are already connected, probably fine. If there's somehow a voltage difference between the grounds of the two systems, then problem.

Look at and think about, maybe even measure resistance, between the grounds of the two IR outputs. I just remembered, too, Xantech outputs have always been voltage to ground, while a dozen years or so ago, Niles LED driving circuits used open-collector circuitry, so the hot signal going into an LED would be power supply voltage; the "ground" of the LED would be connected to ground through a resistor. If the AMX output is open-collector, connecting the Xantech should turn the AMX LED on HARD. Again, look with your cell phone.

The suggestions to use two LEDs should solve the problem if it's ground-related.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw


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