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Project on pulse oximetry - problem with circuit

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maynard790

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Hi, I am a newbie and doing my project on pulse oximetry, i am suppose to do circuit analysis of the circuit i have build, I am suppose to get a gain of 100 for my amplifier, but after doing the calculations my gain is 91 and not 100, i have spend the whole day but still don't know whats wrong... PLease Help!!!!

Here is the link to my circuit
https://www.picotech.com/experiments/calculating_heart_rate/images/pulse-plethysmograph.png

Thanks again!
 

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