•The minimum output voltage is 1.24 volts.
•There is a 1.6 volt drop across the regulator, so the input voltage has to be 1.6 volts higher than the highest voltage that you would want out. For example, to get a 10 volt output, you would have to set the input voltage at 11.6. You can use the voltage meter on your power supply to adjust the input voltage or if more precision is desired, use a multimeter.•To protect against a reverse connection, a 6 amp diode could be placed between the plus input and pin 3 of the LM 338T. The input voltage would have to be increased to compensate for the 0.7 volt drop across the diode.
•If the power supply is not filtered it would be a good idea to put a 2200 µF 35 volt polarized capacitor across the plus and minus inputs. The minus side of a polarized capacitor is the one that is marked with a stripe.