LM 317 Calculator
calculator is used to find the value of the voltage adjustment resistor
required to set the output of an LM317 to a specified level. Typically R1
is 220 ohms or 240 ohms, but it could be some other value.
Check the Data Sheet for more information regarding this. Select a value for R2 and hit the Calculate button. The LM317
output value is reported in volts.
Note: The input voltage to the LM317 must be at least 1.5v
greater than the output voltage.
Note2: You can get ridiculous values with the right combination of R1 and R2. Please note the actual capability of the device from the Data Sheet.