Hi all,

Can anyone please explain how 360 degrees phase shift is achieved with an RC Ladder circuit. I am aware that the three RC ladders each produce a shift of 60 degrees but where does the remaining 180 degrees come from?

Can anyone please explain?

Many Thanks.

 

Hi all,

Can anyone please explain how 360 degrees phase shift is achieved with an RC Ladder circuit. I am aware that the three RC ladders each produce a shift of 60 degrees but where does the remaining 180 degrees come from?

Can anyone please explain?

Many Thanks.

The other 180 degrees usually comes from a transistor inverting stage.

I have used this cct in a wah wah pedal for an electric guitar.
The output of the transistor is fed back through 3 RC's and boosts the input signal at the 180 degree frequency point.

 

Thanks mate!