**LM317**

regulator IC by simply replacing the value of both R1 and R2.

The value of R1 usually varies from 100 t0 1000 ohms while

R2 is of any value and preferably a trimmer type or potentiometer.

The output voltaged desired can be calculated using this formula.

Vout = Vref*(1+(R2/R1))+ (Iadj*R2)

where Vref = 1.25V and Iadj = 100uA.

The

**first calculator**allows you to set the value of both R1 and R2

to determine the output voltage regulated by LM317.

The

**next calculator**allows you to set your desired output voltage and

value of R1 to determine the value of R2.

lm317 regulator |

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