With the help of this article u can easily make 0-30V 0-10A Regulated Variable / Adjustable Power Supply Circuit at home.Every lab needs to be equipped with essential equipment. Out of all I would say power supply is most important since it powers up the projects.
Batteries, DC adapters can do fine job but as demand grows and project gets bigger a professional and adjustable power supply becomes a necessity.
To cater that I have designed an adjustable 0-30V 0-10A regulated variable / adjustable power supply Circuit with a variable output from 0V to 30V and adjustable current limiting from 0A to 10A.
This is the Best Variable power supply Circuit Diagram. You can increase its output ampere just add more TIP3055 Transistor in parallel