> If you have a transformer with a center tapped secondary, (or two 
>  secondaries that can be wired this way), then with one RC network, you 
>  can generate a signal with 0 to 180 degrees of phase shift.
> 
>  Label the secondary as X = top, Y = center tap and Z = bottom.
> 
>  Place a resistor from X to a capacitor that then goes to Z. Label the rc  
> junction as the Output.
> 
> Take your signal from Y to the  Output.  As the resistor value is 
> adjusted, the phase *relative to one  end of the transformer* will vary 
> from in phase to 180 degrees out of  phase.  Somewhere in the "middle" 
> will be found the 90 degree  point.
> 



Do you have some theory behind this? I would like to understand how
it works before building it.
thanx.

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