LM317 Voltage Calculator

lm317This LM317 Calculator can be used to choose the correct resistor values for the LM117-LM317 Voltage regulators.

For an LM317, LM217 or LM117 you can either select your resistor values from the E24 decade list to calculate the LM317 output Voltage, or input your target voltage and value for R1 to get a "ideal" R2 resitor value for the LM317.  This Ideal resistor of course may not exist, but sometimes can be made up from more than one resistor, or alternatively will allow you to estimate the optimum variable resistor value to fine tune your LM317 circuit.

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