Re: [Elecraft] KIO3B USB Surge Suppressor
On 6/28/2019 9:37 AM, Paul Christensen wrote: Looking for input from anyone who has successfully installed a surge-suppression device on a USB port. I am in the process of repairing a KIO3B board after a recent thunderstorm. Paul, The usual cause of destructive failures like these from lightning is interconnection of equipment powered from AC outlets having different green wires, or whose green wires are not bonded together, or equipment whose chassis are not all bonded together. This situation is made worse the use of shunt-mode suppressors on AC branch circuits. Many years ago, colleagues working in pro audio design experienced destructive failures of the ethernet circuitry of networked computers from lightning. No antennas involved -- these were engineering offices. The solution for these failures was (and is) the use of series-mode suppressors on the AC line branch circuits. Surge-X is the manufacturer of these products that has concentrated on the pro audio and video market. There are (were) two other mfrs I'm aware of -- Brick Wall I remember, but not the other. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KIO3B USB Surge Suppressor
Paul... This is not exactly what you are describing, but it fails open. https://hifimediy.com/usb-isolator I've used one at a digipeater site and it took a static hit think - nearby strike - it protected the TNC and PC. It was open on every line. I have used them for ground loops with sound cards. 5000v isolation (advertised), but it did fail open! Hank K4HYJ -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Paul Christensen Sent: Friday, June 28, 2019 12:37 PM To: elecraft@mailman.qth.net Subject: [Elecraft] KIO3B USB Surge Suppressor Looking for input from anyone who has successfully installed a surge-suppression device on a USB port. I am in the process of repairing a KIO3B board after a recent thunderstorm. The KIO3B uses an ST Microelectronics USBLC6-2 ESD protection device at the front end of the K3's USB connector. The protection device is a SOT chip that contains five low-capacitance diodes to clamp voltage to acceptable limits. In this case, the diodes have shorted, causing the USB connector to show a dead short to the PC's USB port, which causes an overload to the PC's USB power bus. This has caused all USB ports to disappear in Windows Device Manager. The short goes on until I can get to the remote site, sometimes days or even weeks later. Ideally, I would like to find a USB protection device that is designed to fail open - open as in an open circuit into the USB driver that follows. That way, I can still find a problem if Windows Device Manager doesn't show a USB connection while not risking the destruction of the PC's USB power bus. Paul, W9AC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to h...@optilink.us __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KIO3B USB Surge Suppressor
Looking for input from anyone who has successfully installed a surge-suppression device on a USB port. I am in the process of repairing a KIO3B board after a recent thunderstorm. The KIO3B uses an ST Microelectronics USBLC6-2 ESD protection device at the front end of the K3's USB connector. The protection device is a SOT chip that contains five low-capacitance diodes to clamp voltage to acceptable limits. In this case, the diodes have shorted, causing the USB connector to show a dead short to the PC's USB port, which causes an overload to the PC's USB power bus. This has caused all USB ports to disappear in Windows Device Manager. The short goes on until I can get to the remote site, sometimes days or even weeks later. Ideally, I would like to find a USB protection device that is designed to fail open - open as in an open circuit into the USB driver that follows. That way, I can still find a problem if Windows Device Manager doesn't show a USB connection while not risking the destruction of the PC's USB power bus. Paul, W9AC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
