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Hello friends, I hope you all are doing great. Today, I am going to share our new online tool which is named as LM317 Calculator. I am quite excited while posting this LM317 Calculator, as I was trying for a long time to post it but couldn’t done it because of few problems. Anyways, its here now and is ready to be utilized. Its nothing but a simple LM317 Calculator. I have included two LM317 calculators, one will be used to calculate the Vout while the other will be used to calculate the resistance (R2).

You should have a look at Introduction to LM317, if you don’t know much about it. LM317 is an IC regulator which is used to regulate the output voltage and its output voltage is regulated depending on the values of both the resistances attached at its output. Here’s our first simple but awesome tool. 🙂

LM317 Calculator

  • First of all, let me give you some basic information of its circuit design.
  • You can check the basic circuit of LM317 in below figure:

LM317 Calculator, lm317 voltage calculator, lm317 resistance calculator

  • You can see that we have Vin which is input voltage and then we have R1 = 510 ohm which is normally a fixed resistance and finally we have R2 which is a variable resistance.
  • Now, by changing the value of this variable resistance, you can change its output, this calculator will be used to calculate those values depending on the values of other two variables:
  • So here are these LM317 Calculators:
LM317 Resistor Calculator
Thanks For Using LM317 Resistor Calculator
Vout: (volts)
R1: (ohm)
R2: (ohm)
LM317 Voltage Calculator
Thanks For Using LM317 Voltage Calculator
R1: (ohm)
R2: (ohm)
Vout: (volts)
  •  The simple formula used for calculating the output voltage of LM317 is shown below:

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  • Normally it is not required to use very specific output voltage and normally a predefined combination of resistors is used. Here’s a list of normally available resistors, the output voltages for these resistor combination is shown in below table:

lm317 voltage divider, lm317 voltage formula, calculate ml317 output voltage

  • I have also designed a Proteus Simulation of LM317 which you can download from LM317 Voltage Regulator in Proteus.
  • Here’s a screenshot of its working and you can see that the output voltage is quite less than input voltage:

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So, that’s all about LM317 Calculator. I hope you are gonna enjoy those tools. If you have any questions then you can ask in comments. Have a good day. Take care !!! 🙂

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