Correct GND on EMG circuit

Discussion in 'The Projects Forum' started by techspec1, Aug 31, 2014.

  1. techspec1

    Thread Starter New Member

    Aug 19, 2014
    Ive been studying instrument amps and filters. I found this schematic online of a single channel eeg and am alittle confused on what the third electrode (very bottom left of schematic) is actually connected to. I know the electrodes that are hooked up to the noninverting and inverting of the instrument amp are grounded to vcc/2. But the schematic is alittle confusing on the third electrode(very bottom left of schematic), is this hooked up to the OV of the 9V supply or vcc/2?. As of right now im more concerned with just hooking everything up. Later on, I plan on playing with the values for my bandpass filter, and then hooking this all up to an Arduino.Any help would be great. Thanks.