I am looking at this power supply

https://recom-power.com/pdf/Econoline/RB.pdf

Specifically the +/-12V version. I need to to just use to it power a split rail op amp. The overall system is powered by 24V. Since the +/-12V is isolated, I take it that I can not just connect grounds together so I can interface the two circuits? Is that what the common pin is for? Also, if I had an isolated supply, does AC coupling the AC signal take care of the interfacing problem as well? Or do they still need to share the same ground reference?

 

I am using that power supply.
I think you want to connect using the gray wires.
See the other options in green, red, blue.

 

Thanks...I just shorted the 0V on both sides and it still worked. The output was a whole volt off, but I am guessing that is because the output was not loaded. The other way would be to use the single sourced varieties like these (https://www.cui.com/product/resource/vx78-500.pdf) and just use two and switch the polarity of the output on one of them.

 

Also, how come the R-78E12-0.5 cannot be used as an opposite polarity, but the R-7812-0.5 can? Is there a different topology in each design?

 

There must be something different inside.