The LM317 voltage regulator can be set to any output voltage
from 1.2 V to 37 V.
You must keep the input voltage between the maximum input
voltage and the drop-out voltage for proper operation.
The maximum input voltage the LM317 is guaranteed to bear is 40
V.
The LM317 is guaranteed to operate when the input voltage is at
least 3 volts above the set output voltage.