need to solve this ecg amplifier using multism

[lewischang]

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 beckchang88@hotmail.com

Deeply thank you for helping me ><

[Tayyab_R]

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.