How do I find the transfer function of this op amp filter. The negative feedback part confuses me

[Mmmmmmeng]

 

[danadak]

Use signal flow graph for manual analysis, or use online tools.

Google "signal flow graph analysis", lots of videos, ap notes, etc...

https://www.ieee.li/pdf/viewgraphs/analyzing_feedback_systems_with_ignal-flowGraphs.pdf

Regards, Dana.