220V 30A switching under 500hz - confused

On March 28th, Solidoodle closed its doors and released a note on their blog about why and how this came to be, but what did they leave out?

Intended for people with little or no exposure to digital logic, as well as those wanting a refresher or to understand Boolean algebra at a deeper level, this article walks through the very basics of Boolean algebra. The goal is to prepare you for subsequent articles that delve deeper into aspects of Boolean algebra.

Over-voltage and over-current protection circuit for use with the C-BISCUIT platform's main computer, the Wandboard.