I am currently building a DIY EEG circuit using this guide. This guide is for when there are two inputs. How can I modify this so that I can also input two EMG signals too?
It is common knowledge that EEGs carry weak EMG signals with it. My idea is toobtain a clean EMG signal from the source, and also obtain a EEG signal (with the EMG noise.)
I would use the differential amplifier with both the EEG and clean EMG signal to effectively cancel out the EMG signal and get a more pure EEG signal.