We can use a transistor with the LM741 IC.
#741 op amp driver#
So it means we will need some kind of driver to control the relay. The relay I have used in this circuit needs around 32milliamps. But if you look at the datasheet you will find that the output current of the LM741 IC is 25milliamps which is not enough to turn on a 12v relay. Now the next step is to use this output voltage to control a Relay which can be used to control a light Bulb. So when the output is high we get around 12 volts.Īt this point, we are able to differentiate between the day and night and accordingly we get 0 volts and 11 volts approximately. The output voltage of the LM741 IC is not exactly 12 volts it can be around 10 to 11 volts. V1 > V2 and the output will be low if V1 V2 the output get High, and at the output, we get voltage which is approximately equal to the input supply voltage which in our case is 12 volts. V1 and V2 will be compared using the LM741. V1 = Reference voltage which is coming from the Variable resistor.
#741 op amp series#
To protect the circuit from such situation the two resistors which are connected in series will provide resistance, so the voltage line will never short with the GND. In a situation like this, it will damage the circuit. Let’s say you rotate the knob of the variable resistor and the resistance gets too low and as a result the 12v get’s short with the GND. Two 470 Ohm resistors are connected in series with the 100k variable resistor, which protects the circuit from the short circuit. This variable resistor is used to set the reference voltage on the Non-inverting input of the LM741 Op Amp IC. The voltage which is fed to the Inverting input of the LM741 IC is compared with the voltage which is coming from the R3 which is a 100K variable resistor. As you can wire from the middle of the LDR and 10k resistor is connected with the Inverting input pin of the LM741 Op Amp IC.
The resistance of the LDR changes with the amount of light falling on the LDR. As the amount of light falling on the LDR changes so the resistance changes due to which we get variable voltage. The LDR and 10k resistor make a voltage divider circuit. The LDR “Light Dependent Resistor” is connected in series with a 10 kilo Ohm resistor. In the above circuit, the LM741 Operational Amplifier is used as the voltage comparator. If you study in detail about the amplifiers you will come to know that any Operational Amplifier can be used as the voltage comparator, but it is not necessary that any comparator can be used as the Operational Amplifier. LM741 Op Amp as the voltage comparator “complete designing explanation:Īs explained in very detail, LM741 is basically an Operational Amplifier but it can also be used as the Voltage comparator. LM741 Operational amplifier datasheet Specs Absolute Maximum Ratings LM741 Op amp IC Pinout / Pin configurationĪs you can see in the picture above, the LM741 IC has a total of 8 Pins which are clearly labeled. In this tutorial, I will explain in very detail how the LM741 Operational Amplifier can be used as the voltage comparator. Lm741 operational amplifier Applications.Ĭomparator is the most important in circuits where two signals voltage to be compared.
No latch-up when the common-mode range is exceeded.Overload protection on the input and output.In the given figure, you can see that the operational amp inverting terminal is connected with pin 2 and while pin 3 is connected with non-inverting terminal.The symbolic representation of LM741 is shown in the given figure as you can see.I would appreciate your support in this way! I may make a commission if you buy the components through these links. LM741 Operational amplifier based voltage comparator project. LM741 Operational amplifier datasheet specs In this tutorial, we will also discuss the extreme basics like for example
#741 op amp how to#
LM741 Operational amplifier– in this tutorial you will learn how to use the LM741 Operational amplifier. LM741 Operational Amplifier, Description: LM741 Op Amp as the voltage comparator “complete designing explanation:.LM741 Operational amplifier datasheet Specs.LM741 Op amp IC Pinout / Pin configuration.Lm741 operational amplifier Applications.LM741 Operational Amplifier, Description:.
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