DIY Lab Bench Power Supply [Build + Tests]

In this instructable / video I will show you how you can make your own variable lab bench power supply which can deliver 30V 6A 180W (10A MAX under the power limit). Minimal current limit 250-300mA. Also you will see accuracy, load, protection and other tests. They should give you better idea, to easily decide, is it worth making it yourself. Provided Amazon links are affiliates. (You can buy through them to support my work)

I would say this is the hardest part of the build - make a square hole at the top of the box. My solution was to drill many small holes, cut out bigger pieces and then sand to the right size. I works well, but it takes a lot of time. If you know better solution, I'm all ears. It must be the easier way?! Right? We should plan the inside layout for the components. You want like AC connectors of the power supply to face the back and potentiometers of the 300W step-down module to face the front. Also try to position those two components that the air from the bottom front would go through all the heatsinks.