The goal of this project was to learn about power supplies and build one. The final product of this project is a DC adjustable regulated power supply that can go up to about 18 VDC. I used a 12.3:1 transformer to step down the 120 VAC from the outlet and a rectifier to convert the voltage to pulsating DC. I smoothed it out with capacitors and I used a voltage regulator – LM317. The variable resistor can be adjusted to change the voltage output. It has a maximum rating of 25 V at 1.5 A.