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Connect the other leg of the trafo to a resistor divider between vcc and ground. A good level at the midpoint is 1.5 v. Works better with single ended inputs.

Sukandar wrote:Hm, I don't think I quite get this. Wouldn't this bias the signal input also around 1.5V?

Yes

How would this register correctly at a standard single ended input?

Let's turn your question around - why would it not work?

Marc