The LM317 (LM317T), and high current LM338 (LM338T) are voltage regulators which can take an input voltage of 3-40 Volts DC, and output a fixed output voltage from 1.2 to 37 Volts DC. The output voltage from the LM317 and LM338 is set using two resistors (R1 and R2) with their values chosen according to … Continue reading LM317 Voltage Calculator