Window Comparator Circuit Design

A window comparator will output a voltage between two selected voltage points and be off outside that range.

Window comparator circuit design.

In order to power the lm741s we apply 5vdc to v pin 7 and we connect v pin 4 to ground. A window comparator is basically the inverting and the non inverting comparators above combined into a single comparator stage. The window comparator detects input voltage levels that are within a specific band or window of voltages instead of indicating whether a voltage is greater or less than some preset or fixed voltage reference point. So the first thing that should be done is powering of the chips.

Figure 5 depicts the proper operation of the window comparator. The outputs of the each comparator in the lm339 is a open collector transistors tied together and connected to a led and resistor. The modified window comparator circuit we will build with 2 lm741 op amp chips is shown below. In order to power the lm741s we apply 5vdc to v pin 7 and we connect v pin 4 to ground.

The breadboard circuit of the circuit above is shown below. T vh vin vl vout time s 0 00 10 00m 20 00m t 0 00 5 00 10 00 figure 5. So the first thing that should be done is powering of the chips. Notice that when the input v in is between v h and v l the output goes to the pull up voltage v p.

The window comparator circuit we will build with 2 lm741 op amp chips and an inverter chip is shown below.