This is another great power supply project. It uses a center tapped transformer, so two choice of two channels is obvious. One channel produces positive 0 to 30V another negative from 0 to -30V. It also has adjustable current limit from 0 to 10A. Variable voltage part is used from his previous simulations. They are similar for positive and negative sides.
Controlling is performed by using Atmega328p microcontroller. Instead of potentiometer there are couple DACs used MCP4821. Microcontroller allows setting precise current limit and voltage. Updated information is displayed on LCD screen. And of course it is always good idea to add constant voltage regulators. Kerry added 12V, -12V and 5V that may be used right away without any settings.