Hi-
What about the technique of using a Mosfet in series with the line with the gate
tied to one of the voltage sources as a level shifter?  I have been reading about
I2C and Phillips shows this technique.
David

Larry Bradley wrote:

> All you may need is a voltage divider using 1% precision metal-film
> resistors. I've been buying these from my local Active dealer - I use a
> digital voltmeter on the ohms scale to match resistor values to 0.1% or so.
>

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