Miscellaneous CalculatorsFree Tool

LM317 Calculator

Provided byOmni Calculatoromnicalculator.com

Omni's LM317 calculator can help you decide what external resistors to choose to get the required output voltage from...

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About this tool

What LM317 Calculator does

The LM317 Calculator on Omni Calculator helps users determine the external resistor values needed to set a specific output voltage when using an LM317 voltage regulator. By entering the desired output voltage and the value of one resistor, the tool computes the necessary resistance for the second resistor to achieve the target voltage. The output provides the calculated resistor values and the resulting output voltage, making it useful for repairing electronics or learning the fundamentals of voltage regulation. The site also includes a circuit diagram and explanations of the LM317's pinout and operational limits, such as its ability to supply 0.01-1.5 A and output voltages between 1.25 V and 37 V.

Step by step

How to use the Omni Calculator LM317 Calculator

  1. 1

    Input the desired output voltage into the calculator

  2. 2

    Enter the value of one external resistor (R1) or let the tool suggest a standard value

  3. 3

    The tool calculates the required value for the second resistor (R2) to achieve the target voltage

  4. 4

    Review the calculated resistor values and the resulting output voltage displayed on screen

  5. 5

    Use the circuit diagram provided on the page as a visual reference for connecting the LM317 regulator

Is it right for you

Best for

Electronics hobbyists, DIY project builders, and students who need to quickly select appropriate resistor values for LM317-based power supplies or voltage regulation projects.

Limitations

  • Results are estimates based on standard resistor values and may require component adjustment
  • Calculator assumes ideal operating conditions and does not account for heat dissipation or load current variations
  • No unit switching available; all values are presented in volts and ohms
Questions

LM317 Calculator FAQ

What output voltage range can the LM317 regulator produce?
The LM317 can provide a positive output voltage between 1.25 V and 37 V, as stated in the tool's description of the regulator's capabilities.
How does the LM317 calculator determine the resistor values?
The calculator uses the LM317 voltage regulator formula, where the output voltage is set by a resistor divider network connected to the adjust pin; entering the desired output voltage and one resistor value allows the tool to compute the necessary second resistor value.
Can the LM317 calculator handle input voltages outside the 3-40 V range?
The tool notes that the LM317 can operate optimally as long as the difference between input and output voltages lies in the range of 3-40 V, so calculations should stay within those limits for best results.
Is the LM317 calculator suitable for beginners learning electronics?
Yes, the page includes explanations of what an LM317 is, its pinout, and common applications, making it accessible for students and hobbyists new to voltage regulator circuits.
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