

That’s just basic electronics stuff. It doesn’t take a terribly large charged capacitor to zap you dead. IIRC, there are some high voltages in CRTs, but if you know how to discharge caps and to never ever work on electronics while plugged in (especially anything AC or DC over even 12v running), you’ll be fine.
Making them, however, is a whole additional technical and mathematical set of skills.





It’s an eye in a triangle. I forget the origin of the iconography though.