How I tweaked the output voltage of an AC adapter, & my approach to understanding circuits

Here's how I modified a 24V AC to DC adapter to output 22V, in order to charge an iRobot Roomba that I rescued from the landfill. I show each step and my thought process behind it, in an effort to demonstrate how non-engineers like myself can understand and responsibly modify devices for new uses (within reason!)

[@630nitronutter]

Nice video bid