Thanx.

Felix - is using a transformer okay? Small transformers usually have quite high no load output. Of course I could introduce a load, but how linear is a standard low cost mainstransformer?

Ijaz - i2c is NOT like RS 232. Isolated 232 is piece of cake: One signal in each direction, and thats it.

I2c is wired and, and not done with just two optocouplers.

Per