USB KILLER V3 reverse engineering in progress UPDATED

[Parrot974]

Oh! yes my bad. I completely messed up the new schematic. So the initial schematic was right after all. they are all in parrallel.
So they should technically withstand 200V. So I guess they are used beyong their voltage rating and the total capacitance is therefore 50µF.

[free_electron]

The idea that you drop one in a parking lot to make random people's lives miserable.  Or teens use it to destroy school computers.

The assholes that find that funny should be removed from the gene pool.

As for destroying school computers : really . This is what moderns society is doing ? we have smartphones with more horsepower than the moonrocket and all we do is send tweets to other twits, facepalmbook each other and post funny cat video's ( ok, those i like ) .
There is no hope for humanity. I'm going to buy an island in the south pacific and the world can go to hell. I'll have mandatory daily beach bbq's.

[Parrot974]

Btw I just found the brand of the transformer. Tokyo Coil.

http://www.tokyocoil.com/EN/product2/index.html

So it confirms that IC3 is a PhotoFlash Capacitor Charger even if I don't know which one exactly.

About the capacitors, according to this link http://www.koaspeer.com/pdfs/MLCC.pdf , the capacitor shouldn't be destroyed by the overvoltage (assuming that they chose a 50V or 100V capacitors) but I'm doubtful about the capacitance during such overvoltages.

[domeniconixavier]

hello a person shares the gerber file to make the printed circuit

[free_electron]

hello a person shares the gerber file to make the printed circuit

no, we don't need more of this bullshit. This is vandalism, pure and simple

[niconiconi]

hello a person shares the gerber file to make the printed circuit

no, we don't need more of this bullshit. This is vandalism, pure and simple

I have two of them. I ordered them only to give me a technical challenge to design an extreme USB port protection circuit. Unfortunately, I found sabotaging is the only possible use case here. They're useless for actual testing.  This is why I went to design an actual, proper IEC 61000-4-5 surge generator for my lab instead.

When a 50 Ω load is connected, it keeps pulsing continuously, peak voltage is typically 140 V, but can be as high as 200 V. Pulse width is about 100 μs to 250 μs. Repetition rate is about 27 pulses per second. The pulse characteristics are poorly controlled. If you don't disconnect it quickly enough, after continuously pulsing for a minute or so. It can no longer generate continuous pulses, and the pulses were no longer as powerful anymore. There's permanent circuit damage - Understandable, given the seriously undersized SMD components to fit inside a USB stick enclosure.

In other words, the USB Killer eventually kills itself for good.

[niconiconi]

This is the open-circuit voltage.

As you can see, it's just a flyback circuit. Nothing terribly interesting.

[T3sl4co1l]

In other words, the USB Killer eventually kills itself for good.

Back when this [the device] was a meme, I had the thought to write an article about it, how it could possibly be used, and how it definitely isn't of any real use... but meh.  And in time, the meme passed, and nothing of value was lost.

Tim