Maby this will help:

E out                            X2
-----   =   --------------------------------
E in            (R1 + R2 + X2) (R1 + X1)
                --------------------------------       -R1
                                    R1

I took this from "Designing Electronic Circuits" by Middleton.
I also have a GWBasic program that will do the calculation for
you if so desire.

----- Original Message ---
> Subject: [EE:] RC filter calculations?
>
>
> For some reason, I can't find (thru google) the formula for calculating
the
> best values of R's and C's in this circuit for a given cutoff frequency...
>
>    >----`\/\/\,----o----`\/\/\,-----o------>
>
>            R1      |       R2       |
>                   ---              ---
>                C1 ---           C2 ---
>
>    >---------------o----------------o------>
>
> Any of you have the formula?
>
> Thanks,
> -Neil

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