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Discussion in 'General Electronics Discussion' started by Akshatha Venkatesh, Jul 23, 2018.

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  1. Akshatha Venkatesh

    Akshatha Venkatesh

    145
    0
    Jan 14, 2017
    Hi, I have a scenario where one end of the resistor in my circuit has 45V and the other end is short to Ground , the 45V end also dips drastically, but not fully to zero , why is this happening , there's also a capacitor involved , is the capacitor trying to avoid the change in voltage.
     

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  2. AnalogKid

    AnalogKid

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    Jun 10, 2015
    Is it shorted to ground because it is connected to ground, or is it connected to something else? Without you showing more of the circuit, and some information about its intended use to put things in some frame of context, it is very difficult to answer your question.

    What voltage
    AC or DC
    what resistor value
    a more complete schematic
    did the circuit ever work correctly, or is this a problem in the first prototype
    photo of the construction

    a.n.y.t.h.i.n.g ...

    ak
     
    Cannonball and davenn like this.
  3. hevans1944

    hevans1944 Hop - AC8NS

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    Jun 21, 2012
    What circuit? Where did the 45V come from? What is the ohmic value and wattage rating of the resistor? Why did you say "the other end is short to Ground"? Where else would you connect the other end? What is the value of the capacitor? What type is it? What is its working voltage rating? What is the meaning of the multi-colored dashed lines in your drawing? What is the meaning of the solid blue circle? Your so-called schematic drawing is not only incomplete but appears to be the work of a three-year old child with a set of colored pencils. Please provide more details about what is going on and what you expect.

    How much does it "dip" and how often does this occur? Why do you think this is abnormal behavior?

    WTF should we know? It's your "circuit" so you tell us what you think should happen. I have misplaced my divining rod today, so no help from me on what's happening.

    You speak of the capacitor as if it has a conscious will and can choose (or not) to avoid the change in voltage. This is never the case in my experience. A capacitor is what it is and responds in electrical circuits according to well-known and well-defined laws of physics. It doesn't try to do anything. It just does what a capacitor does.
     
    Cannonball likes this.
  4. Cannonball

    Cannonball

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    May 6, 2017
    We need more information. Is the resistor connected to ground? What is the value of the resistor? Check the cap for leakage or a short.
     
  5. BobK

    BobK

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    Jan 5, 2010
    What do you expect to happen when you connect a resistor between +45V and ground?

    Bob
     
  6. Cannonball

    Cannonball

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    May 6, 2017
    I would expect a current flow. How much depends on the value of the resistor.
     
  7. FuZZ1L0G1C

    FuZZ1L0G1C

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    Mar 25, 2014
    RC circuit.png
     
  8. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Only after Vcc (45 V) is removed.

    We're clearly in the dark and need Akshatha's answers to Hop's post #3.
     
  9. dave9

    dave9

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    211
    Mar 5, 2017
    We need a forum rule: Post all information or gtfo. :p
     
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  10. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    That should be common sense - unfortunately it isn't :(
     
  11. BobK

    BobK

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    Jan 5, 2010
    And what are you seeing that is different from that?

    Bob
     
  12. Cannonball

    Cannonball

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    May 6, 2017
    Only that the cap would also charge,
     
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