notch filter calculator
Arsenal1,
Are you sure that a notch filter is what you need? A notch filter is used for attenuating a very narrow band of frequencies (an ideal notch filter removes only one frequency, but is not realizeable). Most ECG applicastions use a high order low pass filter to suppress frequencies above the desired range. A linear phase filter is often used to preserve the waveform shape. The filter design is always a compromise between nose rejection and waveform fidelity. Also, you don't mention whether you need an analog or a digital filter. If the output of the sensor is already digitized, then it is practical to use a very high order filter. A Google search for "Notch Filter" or Low Pass Filter" will give you lots of hits.
Regards,
Kral