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
    3
    0
    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.

    https://backyardbrains.com/products/files/EMGSpikerShield.v.1.1.pdf
     
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