obrien.james said:
That you soo much
i completly understand now.
No, you don't. Looking at your most recent post, you definitely don't.
You need two separate power supplies for the transmitter (+5V and -5V), and two more for the receiver.
If ground was connected to nothing, it would not be on the schematic. All the points in the transmitter, and its power supplies, that have the ground symbol must be connected together. All the points in the receiver, and its power supplies, that have the ground symbol must be connected together. The grounds in the transmitter do not have to be connected to the grounds in the receiver. I probably should have drawn the transmitter and the receiver as two separate schematics, to avoid that implication.
You can use two unregulated wall warts for the transmitter, and two more for the receiver, but be aware that, under light loading, the voltage may be higher, so you have to pick op amps that will not be destroyed by the higher voltage.
This place and your guys are the greatest
james
Below are cobbled-up schematics showing the separate circuits with their own power supplies.