<div dir="auto">Crowbar:  series fuse and a shunt clamp. I can only think that a fuse has negligible effect on bandwidth.  There are commercially available crowbar chips for protecting telecommunications equipment from lightning surges, I googled it.  Maybe not small and cheap enough for USB ports, but that's not to say you couldn't produce such a thing.</div><div class="gmail_extra"><br><div class="gmail_quote">On Dec 3, 2016 1:36 PM, "Guan Yang" <<a href="mailto:guan@hackmanhattan.com">guan@hackmanhattan.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div></div><div>There are integrated isolators available for USB. Some are based on giant magnetoresistance, but there are other methods too, like the good old transformer.</div><div><br></div><div>Here's one for full speed:</div><div><br></div><div><a href="http://cds.linear.com/docs/en/datasheet/2884fb.pdf" target="_blank">http://cds.linear.com/docs/en/<wbr>datasheet/2884fb.pdf</a></div><div><br></div><div>I couldn't find any integrated solutions for high speed, but I think it's possible. Gigabit Ethernet is (magnetically) isolated so you can always serialize through that. Or you can go through a set of fiberoptic transceivers.</div><div><br></div><div>Here's an overview of various techniques:</div><div><br></div><div><a href="http://www.digikey.com/en/articles/techzone/2015/aug/digital-isolation-devices-find-pervasive-role-in-energy-harvesting-applications" target="_blank">http://www.digikey.com/en/<wbr>articles/techzone/2015/aug/<wbr>digital-isolation-devices-<wbr>find-pervasive-role-in-energy-<wbr>harvesting-applications</a></div><div><br>On Dec 3, 2016, at 13:11, Michael Robinson <<a href="mailto:elvagante@gmail.com" target="_blank">elvagante@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><span>The writer suggests opto-isolators to protect against killer usb.</span><br><span>Not.</span><br><span>Opto-isolators are slooooooow.  Like a few tens of kilohertz bandwidth at most.</span><br><span>Crowbar circuit, anyone?</span><br><span></span><br><span>On Sat, Dec 3, 2016 at 12:48 AM, Peter S. Shenkin <<a href="mailto:shenkin@gmail.com" target="_blank">shenkin@gmail.com</a>> wrote:</span><br><blockquote type="cite"><span>Sounds like a good Maker Faire project.   ;-)</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span><a href="http://arstechnica.com/gadgets/2016/12/usb-killer-fries-devices/" target="_blank">http://arstechnica.com/<wbr>gadgets/2016/12/usb-killer-<wbr>fries-devices/</a></span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>______________________________<wbr>_________________</span><br></blockquote><blockquote type="cite"><span>Blabber mailing list <a href="mailto:Blabber@list.hackmanhattan.com" target="_blank">Blabber@list.hackmanhattan.com</a></span><br></blockquote><blockquote type="cite"><span><a href="https://list.hackmanhattan.com/listinfo/blabber" target="_blank">https://list.hackmanhattan.<wbr>com/listinfo/blabber</a></span><br></blockquote><span>______________________________<wbr>_________________</span><br><span>Blabber mailing list <a href="mailto:Blabber@list.hackmanhattan.com" target="_blank">Blabber@list.hackmanhattan.com</a></span><br><span><a href="https://list.hackmanhattan.com/listinfo/blabber" target="_blank">https://list.hackmanhattan.<wbr>com/listinfo/blabber</a></span></div></blockquote></div><br>______________________________<wbr>_________________<br>
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