Full Member level 5
Hello, I have a question about active filters. with reference to the image I understand the role of R2 & C2 they are actual low pass filter, but what I don't understand fully,is the role of R1 & C1 why they are necessary? and why R1 should be equal to R2 and C1 equal to C2? I want gain of my filter be one at all frequencies( frequencies less than -3db cut off) can I remove R3 & R4 and directly connect pin 6 OpAmp to pin 2 ?