Design your filter as a lowpass using FilterLab.

Then swap the location of the resistor/capacitor pairs that determine the
frequency response.

Make sure you still have a dc path to every pin. You will then turn the
lowpass into a highpass filter.  Build it and test.

Tom M.


At 06:46 PM 6/10/03 -0400, you wrote:
>Hi Folks:
>
>I need to design an active high pass filter with a cut off of 1KHz.
-SNIP-
>Unfortunately, FilterLab will currently
>only do low pass filters (I know the other filters are coming, but
>unfortunately I need to do this now).
>Thanks in advance!
>
>John Hansen

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