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Caswell 3.5” WTC question

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  • Caswell 3.5” WTC question

    8/25/2021 PM
    David
    I just purchased a 3.5” WTC. The WTC was purchased from Caswell and the previous owner never got it working. I figured out the correct receiver channel and powered it from a 2S battery, I don’t have a 3s battery right now but it requires a 3S battery, and everything worked. I cannot figure out what these black boxes are for in the WTC. The ESC servo connection red power line is taped over and not used.

    WTC-1 & 2 – the part is powered from the battery and goes to a channel in the receiver. (Some sorta voltage regulator)
    Labeling as best as I can tell
    NL
    50
    ^^ MC
    7805CT
    NLBU947


    WTC-3, 4, &5 – the part is on the black lines on the ESC. (I have no idea)
    Labeling as best as I can tell
    JM990A??
    LM29400
    +5.0 P

    Thanks
    Ernie


    WTC-1
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    WTC-2

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    WTC-3

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    WTC-4

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    WTC-5

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    Attached Files

  • #2
    The one with 7805 looks to be a linear voltage regulator.

    If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.

    Comment


    • #3
      Google is our friend-and the other one is: http://www.taitroncomponents.com/cat...eet/lm2940.pdf

      Comment


      • #4
        8/26/2021 PM
        OK, thank you for your answers, I’m a dumb a**. I don’t remember seeing these components installed in other WTC, why would these components installed?

        Comment


        • #5
          Originally posted by SSN687 View Post
          8/26/2021 PM
          OK, thank you for your answers, I’m a dumb a**. I don’t remember seeing these components installed in other WTC, why would these components installed?
          Likely because if you blow up the ESC, you also loose all hotel services, which means no fail-safe. A BEC wired off the main power cable will provide hotel services to everything, directly through the receiver bus.

          David
          Resident Luddite

          Comment


          • #6
            Thanks, makes sense now

            Comment


            • #7
              Originally posted by SSN687 View Post
              Thanks, makes sense now
              Buy Bob's book! Remote control submarines | The Nautilus Drydocks (rc-submarine.com)
              Resident Luddite

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