Can someone please describe the circuit topology for an inverting two pole Sallen-Key (or similar) low pass filter, or point me to a reliable diagram?
There are plenty of circuits online for the non-inverting type, but I am unclear about how the inverting type is built.
I would also like to know how to caluclate the component values for
500Hz cut-off, if this process differs from the non-inverting variety.Robert Stevens