I have a project that requires communication over a DC Bus (19V to 41V). I will use a microcontrollers UART to modulate a signal and have read I can use inductive coupling to couple AC to DC line. And then decouple on other end. Also I have read I will require inductors at DC power supply to isolate AC from DC. I have also read I can use a transformer to couple my ac to DC line. What is the best way of doing this. What circuit can I build/design that does not require a microcontroller to at least test this before hand. I have all lab equipment available: function generator, oscilloscope, dc power supply. I need help!