hi all,
am looking for a LPF with very very high gain and its cut off frequency at 30KHZ i can't find any one till now, what i found is this one
http://www.simplecircuitdiagram.com/2010/02/09/a-20-khz-third-order-low-pass-filter/
but its only 20KHZ and am not sure if its gain is high enough , also i found this wonderful circuit that allow me to choose the desired gain and frequency
http://www.maxim-ic.com/app-notes/index.mvp/id/700
but the problem is the max4174 is no longer available, am still looking for it, any help would be greatly appreciated
am looking for a LPF with very very high gain and its cut off frequency at 30KHZ i can't find any one till now, what i found is this one
http://www.simplecircuitdiagram.com/2010/02/09/a-20-khz-third-order-low-pass-filter/
but its only 20KHZ and am not sure if its gain is high enough , also i found this wonderful circuit that allow me to choose the desired gain and frequency
http://www.maxim-ic.com/app-notes/index.mvp/id/700
but the problem is the max4174 is no longer available, am still looking for it, any help would be greatly appreciated