Hello, I am trying to make a simple ecg/emg acquisition circuit. I am using 2 of these https://www.olimex.com/Products/EEG/Electrodes/EEG-AE/ active electrodes for the differential signal and this https://www.olimex.com/Products/EEG/Electrodes/EEG-PE/ as a passive DRL electrode. My supply is the 5V output of a LM7805 and I create a virtual ground at 2.5V using the TLE2426. This is what I have built in a breadborad. I connect the output of the INA118 to an oscilloscope but nothing usefull is shown. Do you see anything wrong in it?