Hello Andrew, Thanks for your replies. They're great sites, and they both use the 2 Pi R C formula. The thing is I don't see how they get at it, the res and the cap being in series below the inverting input. In a usual high pass filter, active or passive, the voltage is taken between the cap and the...

Hello everybody, First of all, sorry in advance if this question has already been answered, I've looked around but to no success. I've been looking at the corner frequency formula that's generally accepted for the RC filters with a resistor and a capacitor in series going to ground from the feedback...