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## Homework Statement

Please see refer to the attached picture of a Schmitt Trigger. How can you derive a relationship between V_in, V_out and V_ref, given values of R1, R2, R3,R4 and V_cc?

## Homework Equations

Golden Rules for an Op Amp, voltage divider equations, etc.

## The Attempt at a Solution

I'm not sure where to start, any suggestions/hints would be appreciated.