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Capacitor?

Discussion in 'General Electronics Discussion' started by RonD, Jun 30, 2017.

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  1. RonD

    RonD

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    Jun 30, 2017
    I have little experience with electronics. Now that that's out of the way, here is my question with a little background:
    I was recently removing potting epoxy from a speed log transducer that failed. During removal of the material with a dremel tool, I inadvertently cut into a disc capacitor. Once all of the potting was removed the capacitor was unidentifiable, except that I managed to recover the apparently ceramic disc. I could see where the electrodes were attached and with my dmm set on capacitance, I took a reading at the points where the electrodes were originally connected. The reading was .36nf.
    The disc is 5mm dia.
    The question: Is it reasonable to presume that the reading value is correct as the disc was intact just the outer covering was destroyed?
    The fault in the log was a burned junction at the positive terminal at the pcb. This had no proximity to the capacitor.
    The log transducer: Input voltage - 12vdc, 4 wires(2 supply voltage and 2 output channels, 1 speed by hall effect sensor, 1 temperature method unknown).
    Any wisdom appreciated.
    Ron
     
  2. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Can you take a picture of the damaged capacitor and post it for us to see?
    Thanks
    Adam
     
  3. Alec_t

    Alec_t

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    Jul 7, 2015
    There's a good chance a cap that size would have a value the same as or close to what you measured. 330pF, 360pF and 390pF are standard values.
     
  4. RonD

    RonD

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    Jun 30, 2017
    P1040596mod.jpg
     
  5. RonD

    RonD

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    Jun 30, 2017
    Adam: I think I posted a photo of the cap and board for your reference.
     
  6. RonD

    RonD

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    Jun 30, 2017
    Alec_t: Thank you for your input.
    Ron
     
  7. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Oh my... you didn't just cut into it, you cut it in half lol :) I don't think you are going to be able to tell what capacitor that is from the damage that has been done.
    Adam
     
    davenn likes this.
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