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  • EEVblog #304 – Mailbag

    Posted on July 5th, 2012 EEVblog 14 comments


    What’s in Dave’s mailbag this week?
    www.sleepyrobot.com
    people.osmocom.org/tnt/hw/pulse_gen/

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    • Philip Freidin

      No need to be ashamed by item 1, it takes all kinds to make the world go round, and to each his (or her) own.

    • bruno

      Hey Dave.

      I was thinking, for the broken LCD window, couldn’t you remove most of the broken glass, and then pour some 2-part clear epoxy on top? Or would shrinkage, heat dissipation (while the mix cures), or whatever, cause problems?

      As for CC dummy loads, are those a bit like DMM’s, where you can’t really have too many of them?

      Regards
      Bruno

    • pan

      at 3:00 i was SO expecting it to be an accompanying dildo :p

    • f4eru

      Take the dress appart ;)))
      I vote for a teardown (on an appropriate model :)

    • snoopy

      I have the exact same digital calipers which I bought from a computer swap meet for 20 bucks. It came in a nice plastic case so I am surprised that yours didn’t. Believe it or not these are very high quality compared to a lot of others. The residual offset can be reset by pressing the zero button. They are great for measuring up stuff when you are laying out pcbs’s.

      • huh

        Same caliper here, nice plastic case included.
        If that port allows reading their measured data, these cheap calipers could be hacked into linear encoders for CNC machines or robotics.

      • Goophy69

        Same here, but 9 bulks from ebay

    • Roger

      Re. the C C dummy load.
      For longer use when the power-dissipation on the heat-sink gets to high. Connect a power-resistor in series with the load. If you calculate the value with regards to the current and the voltage you can make most of the power dissipate in the resistor. A power-resistor can stand much higher temperatures than a mosfet.
      Just don´t burn yourself on it!
      I have used this in a 12V 100A CC load for a long time. Works great!

      Keep it up Dave!

      Roger

    • Richard

      Does anyone know where the nice PCB mounted BNC connector can be obtained from / what it’s part number is?

      Thanks all,
      Richard

      (Shamelessly crossposted here after first posting to the dedicated video #306)

      • Philip Freidin

        It is called a “Board Edge End Launch” connector. For example, this looks like what the board uses: http://www.digikey.com/product-detail/en/361V504ER/991-1036-ND/2355574

      • Philip Freidin
        • Richard

          Thank you very much!

        • Drone

          Nice connector find. I wish these came with a threaded end and a “D” cut to prevent them from spinning if the panel nuts come loose.

          Also, if you panel or box-mount these type of board-captive connectors, make sure your panel or box is thick and robust so the connector doesn’t flex when you hang a lot of stuff on it. Otherwise it will stress the board connection (especially is soldered with RoHS compliant solder).

          I know this from experience. More than once I’ve encountered the likes of VSAT transceivers that use connectors like this but don’t pay proper attention to mechanical design – fail.

          Regards, David in Jakarta

    • chippy

      Is it just me ?
      the video ends in the middle of a sentence at 6:57 .