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Capacitor help

Discussion in 'Repairing Electronics' started by Felto1, Feb 21, 2017.

  1. Felto1

    Felto1 New Member

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    Can someone help me with a capacitor that's on board that I cannot identify. It is clear with strips on it.
    It is not a resistor. It does not have any markings on it. it has a green and an orange strip going across it.

    Does anyone know what the value would be for this capacitor? thanks in advance.
     
  2. MikeMl

    MikeMl Well-Known Member Most Helpful Member

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    Can you post a picture?
     
  3. Felto1

    Felto1 New Member

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    thank you for responding, Actually it has 3 stripes. Black, Green, Orange. Here is the picture


    If you can tell me the value and voltage. that would be great.
     

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  4. dave

    Dave New Member

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  5. MikeMl

    MikeMl Well-Known Member Most Helpful Member

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    I have some that look like that in my junkbox (different colors). I have never figured out how to read them...
     
  6. ronsimpson

    ronsimpson Well-Known Member Most Helpful Member

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    How do you know it is a capacitor?
    Have you remove one and tried to measure the capacitance?
    upload_2017-2-23_19-49-43.png
     
    Last edited: Feb 23, 2017
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  7. vtech

    vtech Member

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    Not sure but I don't believe it is a capacitor?
    I used to see something almost identical on many of the Phone line related equipment. It was meant for protection against lightning/surge on the signal lines. --also known as arrestor/sidactor..etc. The color bands denoted rating but I do not exactly recall.

    If that is the device, it should not measure anything on a meter either way since it is an open crowbar.
    Another giveaway is to look at the odd numbering nomenclature if mounted on a PCB. such as cx,sc,tc etc.
    Pix attached part.jpg
     
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  8. Felto1

    Felto1 New Member

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    Can anyone please tell me what the value and voltage is for this capacitor?
     
  9. Felto1

    Felto1 New Member

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    See picture below
     

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  10. kubeek

    kubeek Well-Known Member

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    Why do you think that is a capacitor? It looks more like a diode would look like, guessing a zenere diode by the color stripes.
     
  11. EvilGenius

    EvilGenius Member

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    Looking at it twice, I believe you are right Kubeek. It looks like a zener diode. Or a surge arrester.

    Edit: After a bit of research, the color bands follow something similar to resistors. The wider band is your start color (anode). In this case you have orange, blank, green, black.
    I believe the numbers will read: 1N3051
    If it is the case, it is a Zener diode, Microsemi, Vz=200V, Iz=4.6, Resistance 1500 Ohms.
    Place your voltmeter on the Orange pin to positive and black to negative and see what you read?
    Also if you have a photo of PCB from the above, it might give us additional clues.
    Regards,
    EG
     
    Last edited: Feb 24, 2017
  12. ronsimpson

    ronsimpson Well-Known Member Most Helpful Member

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    I think it is a spark gap / ark arrestor /voltage limiting/ thing.
    I find them on telephone equipment to limit voltage (lightning).
    This type is used on small TV sets (CRT) and small monitors (CRT).
     
  13. ronsimpson

    ronsimpson Well-Known Member Most Helpful Member

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    Here is a picture of a spiral cut film resistor. The resistive mater is cut to make a long thin piece.
    [​IMG]
    A ark arrestor is made just like the resistor BUT the cut(s) are all the way around. This way not current will flow. The width of the cut sets the breakdown voltage. When the voltage is too high current flows. Usually found in a clear glass enclose, so you can see if it is burned out.

    It will measure very high resistance. You probably will see open circuit.
    The capacitance is very low. 5pF at most.
     
  14. Mickster

    Mickster Well-Known Member

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  15. Tony Stewart

    Tony Stewart Well-Known Member Most Helpful Member

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    I think it's a 350V (Orange Green brown ) Gas Tube from Mitsubishi DSS-351M
     
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  16. ronsimpson

    ronsimpson Well-Known Member Most Helpful Member

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