The copy is egregiously sloppy in places. The title is surely the most problematic, but the entry for Schmitt Trigger might be the worst: Schmitt Trigger:

The copy is egregiously sloppy in places. The title is surely the most problematic, but the entry for Schmitt Trigger might be the worst: Schmitt Trigger: Comparitor circuit wityh The list is decent, and intentionally superficial -- it's a list, not a textbook. The guy seems to know his material, but English might not be his first language, and I don't think proofreading happened. I would guess that the list grew out of years of conversations and exposed gaps of shared knowledge. It's a good list of things that establish a common vocabulary in a specific industry.