14-3 shared neutral

[Ingvar Esk]

But It Is Not A Phase Shift! It Is Merely A Polarity Inversion!

Some transvestites _look_ just like women - until you get under the
covers!

A phase shift oscillator works because the 180 degree phase shifted
negative feedback _looks_ to the opamp _exactly_ like in-phase positive
feedback. The opamp doesn't know it's in an oscillator - it's only
amplifying.

But just because it _looks_ the same, doesn't mean that it _is_ the
same.

Thanks,
Rich

Anothor way to illustrate the difference is to use a non-pure sine wave.
Let's assume you have some strange load that causes a spike on the top of
every positive period. In a scope you will see the spike move to left or
right with a phase shift and to move to the negative side in the case of
inversion.

/Ingvar