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Thread: Sloppy designs

  1. #11
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    As I mentioned at the start


    Quote Originally Posted by ashiekh View Post
    a power transistor compressed between a capacitor and an inductor coil; an inductor
    mounted on long legs above two tall capacitors.
    Last edited by ashiekh; 06-01-2020 at 06:23 PM.

  2. #12
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    Quote Originally Posted by ashiekh View Post
    As I mentioned at the start
    I'm sure it's fine.


  3. #13
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    Default Copper plate

    Today I worked on an old power supply and near one side was a vertical copper plate maybe 1" x 1/2" with nothing attached.

    What purpose might such a plate serve?

  4. #14
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    At first I wondered if it wouldn't be used for fake weight, however copper would not be a good choice of metal for this.

  5. #15
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    Quote Originally Posted by ashiekh View Post
    Today I worked on an old power supply and near one side was a vertical copper plate maybe 1" x 1/2" with nothing attached.

    What purpose might such a plate serve?
    Can't say without pictures.

    Some times you'll see a copper plate without anything on it, but it's attached to something on the PCB, even the opposite side of the PCB, that needs a lot more sinking that what they can fit on the PCB itself.

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    EMI shield ?

  7. #17
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    Quote Originally Posted by Juular View Post
    EMI shield ?
    Yes. That is required sometimes too.

    Just no knowing without a picture (context).

  8. #18
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    Opened it up for a picture; one can also see an inductor on long legs floating above a capacitor mentioned in http://www.jonnyguru.com/forums/show...831#post163831

    I had to de-solder the copper plate to replace the 16V capacitor behind.
    Attached Images Attached Images
    Last edited by ashiekh; 06-06-2020 at 08:59 AM.

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    Quote Originally Posted by Jon Gerow View Post
    So now that we got that mystery out of the way.... what makes it sloppy?

    That inductor up above the capacitors

    The copper plate is asked about in a separate thread http://www.jonnyguru.com/forums/show...997#post163997
    Attached Images Attached Images

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    Quote Originally Posted by ashiekh View Post
    copper plate
    Sounds unlikely given how old and low end this unit is but perhaps there are power components on the other side of PCB and this plate acts as a heatsink ?

  11. The Following User Says Thank You to Juular For This Useful Post:

    ashiekh (06-06-2020)

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