In class we discussed an op amp comparator circuit as shown

In class, we discussed an op amp comparator circuit as shown below in Figure 4. For this circuit, whenever v, > vref. Vo goes to the positive power rail. Else, vo goes to the negative power rail. Throughout this part, assume that the power rails are ±5 V. Vi re Figure 4. Comparator circuit. Now consider the circuit of Figure 5

Solution

Answer for Figure 5

For Vi = 1 volt then Vout will be positive rail

For positive rail LED1 will turn ON

For Vi = -1 volt then Vout will be negative rail

For negative rail LED2 will turn ON