Hi
In our design we use single lead ecg reading using ads1291 ; when the system powered from the battery only we can read nice ecg from the human body ; when we power it from 220VAC ( power supply ) the ECG change to strange signal . we are using low pass filter 30 HZ FİR 30 taps to remove 50hz .
please check the shematics ; could you advice us to solve the problem ?
Thank you in advanced 8105.ecg texas.PDF