Simple 3 Input and Gate Comparator Circuit Diagram

This is a Simple 3 Input and Gate Comparator Circuit Diagram. This circuit has high output only when all three inputs are high. The non inverting-input current, when all three inputs are high, must exceed that of the inverting input, as determined by R4. The circuit can be converted to a AND gate by transposing the two inputs of the op amp.

3 Input and Gate Comparator Circuit Diagram