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Capacitor Value

Discussion in 'General Electronics Discussion' started by Cadishead, Sep 3, 2014.

  1. Cadishead

    Cadishead

    3
    0
    Sep 3, 2014
    Hi All,

    I need to identify the value of a capacitor. It has 4.7K400 then I think it's "I" but I cannot really read the last letter. I have attached a photo so that you can have a look.

    I would be grateful if somebody could tell me what the value of it should be.

    Cheers,
    Andy
     

    Attached Files:

  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,266
    Nov 28, 2011
    Hi Andy and welcome to Electronics Point :)

    4.7 μF, 400V, ±10% (the 'K' means 10%).

    http://www.digikey.com/product-detail/en/ECW-FD2W475J/P16728-ND/4271850

    Edit: The ones you have there look like "MKT" types made by Philips (now BC Components, part of Vishay). The data sheet for the same or similar parts is at http://www.vishay.com/docs/28132/mkt368.pdf but that value/voltage combination is not listed on that data sheet. The Panasonic one linked above would be a suitable replacement, if that's what you're looking for.
     
    Last edited: Sep 3, 2014
  3. Cadishead

    Cadishead

    3
    0
    Sep 3, 2014
    Thank you very much for the response, that was very helpful. I have bought some of your suggested Panasonic caps. I have also bought some 4.7uF 400V electrolytic caps. What is the main difference in functionality between electrolytic caps and the polyethelene caps which I currently have?

    Regards,
    Andy
     
  4. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,266
    Nov 28, 2011
    Electrolytic capacitors are polarised! The originals are non-polarised, and for a reason. Don't use electrolytics in that part of the circuit!

    Are these capacitors are in some AC mains input circuitry?
     
  5. Cadishead

    Cadishead

    3
    0
    Sep 3, 2014
    No, they're used in a DC circuit on the back of a detector. They are part of a high pass filter. So they're in a voltage divider circuit but now and again the odd pulse is collected by some anodes which these caps are supposed to allow to pass. I think you are right with respect to the polarisation issue because I will have negative pulse passing in the opposite direction to that of the D.C. potential gradient.
     
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