Nothing complex 1.25-30V up to 1.5A, regulation provided by a LM317 controlled by a multi turn pot. This was my first go at a power supply. It works well for powering all my simple experiments.
A simple office clock built with the Arduino firmware (although without an Arduino board) and a battery backed RTC. Design is inspired by the film Brazil with the 7 segment LED display set behind a magnifying glass.