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  3. Copper Foil Laminates - Flex sensors

Copper Foil Laminates - Flex sensors

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  • F Franz Klein

    Where in the UK can I buy 'copper foil laminates'? I want to make these bi-directional flex sensors: http://www.instructables.com/id/How-to-Make-Bi-Directional-Flex-Sensors/[^]

    I am the handsome one in the crowd.

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    Roger Wright
    wrote on last edited by
    #20

    You might want to try using this stuff[^], if you can find a distributor. Alternatively, you may want to beg for a free sample from their Sales & Support[^] page. You'll probably have to lie, and convince them that you're evaluating their product for use in a new product of your own with projected high volume sales, but that's only hard to do the first time. :-D What you're trying to build is a form of strain gage, which are commonly used for measurements of deflection in solid materials. They are available commercially, but can be very expensive. This type of device is typically used as one leg of a Wheatstone bridge to linearize the response and increase sensitivity. The circuit is excited with a small ac or dc (ac has some advantages), and the output coupled into a operational amplifier. The amplified output can be digitized, with or without pre-filtering, and used for all manner of handy calculations. If you're not averse to spending some cash, look into commercial strain gages; they're precision devices and far more accurate and dependable than the homebrew kind. Also, keep in mind that strain gages increase in resistance when flexed, while the sandwich variety decreases with increasing strain.

    "A Journey of a Thousand Rest Stops Begins with a Single Movement"

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    • R Roger Wright

      I got hit with the same fake antivirus attack last night on Facebook - twice! Both times it did a browser hijack within a few minutes of entering the Farmtown game. It's not a new approach, as an almost identical attack has been reported sporadically at work for months, but it is a new (January) virus payload, according to Computer Associates. The current variant is called 'fake Antivir' and installs the virus code if you click on OK at any point. Closing the browser instance is supposed to block the installation.

      "A Journey of a Thousand Rest Stops Begins with a Single Movement"

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      LloydA111
      wrote on last edited by
      #21

      Twice? Does your computer have a virus?

      I know you believe you understood what you think I said, but I am not sure you realize what you heard is not what I meant.

      My operating system kernel the first time it booted

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      • L LloydA111

        Twice? Does your computer have a virus?

        I know you believe you understood what you think I said, but I am not sure you realize what you heard is not what I meant.

        My operating system kernel the first time it booted

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        R Offline
        Roger Wright
        wrote on last edited by
        #22

        Nope - freshly scanned. And no malware that AdAware or CA Antispyware can find.

        "A Journey of a Thousand Rest Stops Begins with a Single Movement"

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        • R Roger Wright

          Nope - freshly scanned. And no malware that AdAware or CA Antispyware can find.

          "A Journey of a Thousand Rest Stops Begins with a Single Movement"

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          LloydA111
          wrote on last edited by
          #23

          I've just scanned with Sophos, didn't find anything:thumbsup: Just doing a scan with AdAware now. Maybe it is somehow a browser hijack from the server end?

          I know you believe you understood what you think I said, but I am not sure you realize what you heard is not what I meant.

          My operating system kernel the first time it booted

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          • L LloydA111

            I've just scanned with Sophos, didn't find anything:thumbsup: Just doing a scan with AdAware now. Maybe it is somehow a browser hijack from the server end?

            I know you believe you understood what you think I said, but I am not sure you realize what you heard is not what I meant.

            My operating system kernel the first time it booted

            R Offline
            R Offline
            Roger Wright
            wrote on last edited by
            #24

            That's what I suspect, and when I later returned to the Farmtown game from Facebook, it did not happen again. I suspect that the owners of the site detected it and removed it quietly. According to CA, this is currently the top threat in their list, with a risk rating of Medium. They also provide complete details of the files and registry changes that have to be removed to get rid of the thing if infected. None exist on my machines.

            "A Journey of a Thousand Rest Stops Begins with a Single Movement"

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            • R Roger Wright

              That's what I suspect, and when I later returned to the Farmtown game from Facebook, it did not happen again. I suspect that the owners of the site detected it and removed it quietly. According to CA, this is currently the top threat in their list, with a risk rating of Medium. They also provide complete details of the files and registry changes that have to be removed to get rid of the thing if infected. None exist on my machines.

              "A Journey of a Thousand Rest Stops Begins with a Single Movement"

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              LloydA111
              wrote on last edited by
              #25

              Do you have a link to the details of the registry changes? I would like to check my machine :)

              I know you believe you understood what you think I said, but I am not sure you realize what you heard is not what I meant.

              My operating system kernel the first time it booted

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              • L LloydA111

                Do you have a link to the details of the registry changes? I would like to check my machine :)

                I know you believe you understood what you think I said, but I am not sure you realize what you heard is not what I meant.

                My operating system kernel the first time it booted

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                R Offline
                Roger Wright
                wrote on last edited by
                #26

                Here[^] you go... :)

                "A Journey of a Thousand Rest Stops Begins with a Single Movement"

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                • L LloydA111

                  Do not go on the link that is in that post, the site looks OK at first, but then redirects to some other site, and then it comes up with a warning saying something along the lines of "You need to install anti malware" and has a screenshot of Windows Explorer. The site is clearly some kind of site that tries to get unsuspecting users to click the OK button and install a load of crap. Edit: Heres a pic of it to prove it. ^. I think the site only affects Opera as it does not seem to affect IE, Chrome, or FF.

                  I know you believe you understood what you think I said, but I am not sure you realize what you heard is not what I meant.

                  My operating system kernel the first time it booted

                  modified on Sunday, February 14, 2010 7:59 AM

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                  H Offline
                  Hired Mind
                  wrote on last edited by
                  #27

                  This is definitely a new virus. Saw it on a PC at work two days ago and listened to the admin ranting about what he'd do to the "pissant little punk" who wrote it... (The PC in question was never exposed to the instructables site) Sorry I don't have a name or something for you - just heard it in passing as I looked over our poor admin's shoulder - I think he called it "rogue Anti-malware virus," but that could have been merely descriptive. I'm sure that if you use the CD-boot version of a good AV, you should be able to find and remove it.

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                  • L LloydA111

                    Do not go on the link that is in that post, the site looks OK at first, but then redirects to some other site, and then it comes up with a warning saying something along the lines of "You need to install anti malware" and has a screenshot of Windows Explorer. The site is clearly some kind of site that tries to get unsuspecting users to click the OK button and install a load of crap. Edit: Heres a pic of it to prove it. ^. I think the site only affects Opera as it does not seem to affect IE, Chrome, or FF.

                    I know you believe you understood what you think I said, but I am not sure you realize what you heard is not what I meant.

                    My operating system kernel the first time it booted

                    modified on Sunday, February 14, 2010 7:59 AM

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                    M Offline
                    Mark_Wallace
                    wrote on last edited by
                    #28

                    Just tried with Opera, and got no pop-ups. Did you have any other tabs open, at the time? One of them might have loaded an infected banner on refresh.

                    I wanna be a eunuchs developer! Pass me a bread knife!

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                    • R Roger Wright

                      Here[^] you go... :)

                      "A Journey of a Thousand Rest Stops Begins with a Single Movement"

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                      L Offline
                      LloydA111
                      wrote on last edited by
                      #29

                      Sorry for the late reply, I've been away :) Thanks for the link! Done a look in the registry for the keys etc, none found. And the antivir.exe file does not seem to be on the computer :)

                      I know you believe you understood what you think I said, but I am not sure you realize what you heard is not what I meant.

                      My operating system kernel the first time it booted

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