http://img194.imageshack.us/img194/1452/schimitttrigger2.jpg
some one explain to me how to analysis these schmitt trigger op amp circuits?
I want to calculate the Upper trigger voltage(UTP) and the Lower trigger voltage (LTP) of these circuits, but i don't know how to start and how to analysis the circuit.
Hope someone can show some calculations and explain it to me please, thanks alot.