On 7/10/05, Marcel Birthelmer <marcel@carrietech.com> wrote:
> Hi all,
> apologies for the n00b-ness of my question but being a first-year EE
> student I haven't learned enough useful things yet to figure out the
> workings of the following circuit:
> 
> http://marcel.carrietech.com/phase.png

 This is a wrong drawing, as it's will be an oscillator, change the
+input with -input
on the OA. Then the gain will be:

 A = - (1-j*omega* Rv*C)/(1+j*omega*Rv*C) where omega is 2*pi*f
The phase shift will be:
Fi = -2*tan^ -1 (omega*Rv*C) - 180
so the phase shift will be between -180 to -360 degree

best regards,
Vasile

> 
> This is a phase shifting circuit (Rv being variable) that I found
> online. Could someone please explain how to calculate the output voltage
> given the input voltage and the various components? I've checked all my
> EE books (which are all intro level, unfortunately) and have come up dry.
> Thanks,
> - Marcel
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