Butterwoth Low Pass Filter

[zawminoo]

Hi...

I want to construct a butterworth second order low pass filter.
I don't need to amplify gain.( want to same amount of input voltage and outputvoltage).
But I want to remove noise: cutoff frequency= 10Hz.
What OPAmp is suitable?
Can you help me?

Can LM741 use in this?
I made an unity gain lowpass filter but it not same i/p V & o/p V.

Please give your design.

Zaw

 

[gevy]

You may use FilterLab Software from MicroChip

**broken link removed**

 

[ronyutp]

You could also try the book

"Circuits and filters Handbook"

at:

 

[Miguel Gaspar]

Well an jfet o mosfet input opamp, ferforms better than lm741, TL081 is a good one or the LM324.