The USB Killer fascinates me as a product. Simply plug it in, and it fries all of your electronics. Fundamentally, the theory behind its operation seems straightforward. It charges up (what I assume to be) supercapacitors, and then discharges them. It seems straightforward in concept, but fundamentally, I have questions about how it works.
1. USB's a standard, and you're pumping out current at the data lines. Is it a fixed resistance seen at the data lines, or can it vary by device? Asking cause wouldn't resistance affect current flow from the USB killer? Ohm's law and all that? On that note, how does the damage spread rather than just damaging the USB bus only?
2. Thinking about it, the voltage seen at the data lines has to be more than 5 volts, right? If the input resistance is fixed in all devices, I don't see how 5 volts can be a high enough voltage to damage anything. I would assume a boost converter is necessary. But it would have to be small enough to fit the size of a thumb drive.
Also curious...I never used one before, but is it possible to salvage anything from the aftermath? I can understand how it kills a motherboard on a computer, but do the effects spread to other peripherals like a hard drive?