## Thursday, September 20, 2018

### Project: How to Build a Voltage Sensor using LM741

Eltronicschool. - This is one of project to build voltage sensor using LM714. The main circuit schematic of voltage sensor using LM741 shown look like Figure 1. The main component in this project is LM741 IC.

In this time we will show you one project of voltage sensor circuit schematic based on LM741. Beside circuit schematic shown, we also will give you global description about this project.

Circuit Schematic

 Figure 1. Circuit schematic of voltage sensor using LM741. (Source: http://www.learningaboutelectronics.com)

Component Part
1. LM741
2. Resistor
3. LED
Description

Circuit schematic like in Figure 1 above is voltage sensor using LM741. The main component used in this project is LM741.

How it works

According learning about electronics site describe that reference voltage of 5V connected to the inverting terminal. This 5V forms our voltage threshold level. If the voltage at the noninverting terminal is less than 5V, then the output will be off or LOW. If the voltage at the noninverting terminal is greater than 5V, the output will be on or HIGH. To the noninverting terminal, we connect the test voltage signal we want to test.

How the circuit works is very basic. If the voltage at the noninverting terminal is less, the LED is off. If it is greater, the LED turns on. This is how we form a voltage sensor circuit based on any voltage value. We can, of course, change the voltage anywhere from -15V to +15V.

If you want to be able to constantly vary the voltage, you can place a potentiometer either at the inverting terminal or noninverting terminal or both and connect it to greater voltage to get a greater varying range. But this is how a basic voltage sensor can work.

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