I need to design and build a notch filter to remove the 50 Hz main electricity before outputting my ECG (ElectroCardioGraphy signal) on an oscilloscope.
I used this source to build one http://www.radio-electronics.com/info/circuits/opamp_notch_filter/opamp_notch_filter.php
I'm using the LF351 op-amp because it's got high noise impedance (am I right in that ?)
I've attached screenshots of my circuit, and a bode plot and all. Please have a look at them.
The question is, how can I optimize my notch filter ? how can I make signals of 40 and 60 less attenuated (since I only want 50 to be attenuated to zero) ? How can I make it more accurate basically ? Please feel free to suggest :D