The ciruit in question is as above.We are supposed to find the output if the input is a sine wave with a peak of 10V.This is what I think. The circuit is that of a window comparator. The input at the non-inverting terminal of the top opamp is 12*9.1/(7.5+9.1) =6.578 V The input at the inverting terminal of the down opamp is 12*1/(8.2+1)=1.304 V As far as I understand the output of the comparator will be positive only if the outputs of both the opamps are positive. The output should be postive saturation only if 1.304 < Vin <6.578 The Blue wave is my Input and the Red is my output. Am I correct?