Need to solve this ecg amplifier using multism

hi, everyone, I am an undergraduate student currently doing a project making ecg amplifier
however, I could not come up with a correct answer,
theoretical the gain should be around 2000
but the oscilloscope that I used in Multism could not show this result
May anyone give me some clues?
I will be very happy with any of your answers and help
my e-mail is [email protected]
Deeply thank you for helping me ><
Attachments:
amplifier.ms11 ‏123 KB

Hi,
The problem seems to be that the input to the last opamp U4C is not switching and thus you are not seeing a change in the output. I would suggest look over the circuit and make sure all the connections are made correctly.
Regards,
Tayyab R,
National Instruments.

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