The typical AC waveform, zoomed in. The frequency is 4.325 kHz, peak-to-peak voltage is 158 V.

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1. niconiconi (niconiconi@cybre.space)'s status on Tuesday, 25-Jan-2022 05:06:16 UTC niconiconi

   in reply to

   USB Killer waveform captured - 4 kHz inverse sawtooth wave, 622 ns rise time, 172 volts AC peak-to-peak. The sawtooth wave itself is riding on a 138 volts DC bias, giving a total peak voltage of 310 volts AC + DC. The DC bias decreases as the stored energy goes down, the pulse stops after 20 seconds.

   Unlike the original version, this particular variant uses a positive, not negative surge, and also adds a huge DC bias to the pulse. Its designer must have spent much time on improving its destructiveness. And curiously, it attacks only D-, not D+ data line, not sure if it's a manufacturing defect, or an intentional attempt to concentrate energy on a single line. #electronics