variable bench top powersupply

This instructables will show how I built a variable voltage power supply based off of the lm338 variable voltage regulator. The lm338 circuit is very simple and can be made with only the voltage regulator, a resistor and a potentiometer. the voltage regulator relies on the voltage given to its adjust pin, this voltage is adjusted using a resistor and a potentiometer to change the voltage given to the adjust pin. the capacitors are used for smoothing the input voltage and output. The lm338 can output a constant 1.2-30vdc at 5 amps (adjustable volts), input of 33 vdc or lower (input has to be a couple volts higher than output) and a peak current of 7 amps. the full datasheet of the lm338 can be seen here!”