ECG Circuit problem

Thread Starter

Johnny1010

Joined Jul 13, 2014
96
Hello everyone, I am using the attached circuit schematic to get ECG signal, Instead of getting ECG signal, the output looks like as in the attached image, the output signal is taken at the node between R2(100k) and R5(100k) after the low pass filter. The PQRS peaks are not comprehendable. The instructable I am following gets a clean ECG. Is there a possibility that the oscilloscope power noise is being coupled. Any Help would be appreciated. here is the link to the instructable I am following:
http://www.instructables.com/id/Electrocardiograph-Heart-Rate-Monitor/
 

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Thread Starter

Johnny1010

Joined Jul 13, 2014
96
@AnalogKid The ground clip of the oscilloscope is connected to the common ground of the supplies (i.e. of the 9V batteries) in the schematic.

I just connected the output of the circuit to the arduino uno instead of the oscilloscope trying to keep everything battery powered and the results appear to be something closer to an ECG.
ecg1.png
 
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