Re: [Repeater-Builder] Re: Monitoring Positive Ground 48 to negative Ground 0-5

[DCFluX]

How about a Optoisolator? Like a 4N25, I'd use a 47K resistor on the
LED side and play with the resistor value on either side to get the
readings right, but its what they do in switch mode supplies to make
the DC side talk to the AC control circuits.