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Capacitor values

Discussion in 'Electronic Repair' started by Joseph Wages, Jul 16, 2004.

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  1. Joseph Wages

    Joseph Wages Guest

    Something I should know but don't. An very old radio capacitor is marked
    ..003 MFD. Is that microfarads, milifarads or what. Everything I see today
    is marked (mu)farads.
  2. Ken Weitzel

    Ken Weitzel Guest


    (very old radio guy :)
  3. alpha_uma

    alpha_uma Guest

    Or, "mega"? :)

    Seriously, if the product came from the U.S., and if it is very old, it is
    probably a safe bet that the uppercase "M" did not mean "mega", and they
    probably meant "micro". One might be able to "guess" the value of the cap
    more accurately from a schematic showing how the cap is being used.

    In the SI notational standard, uppercase "M" means "mega":

    M (uppercase Roman): mega = 1,000,000
    m (lowercase Roman): milli = 1/(1,000)
    "mu" (lowercase Greek letter "mu"): micro = 1/(1,000,000)

    Since "mu" usually does not appear on a computer keyboard, people these days
    type "uF" for "microfarard".


    [OT: "SI units" have never quite caught on in the U.S. generic public. It
    probably never will. I find it quite amusing and ironic that the U.S.
    general public is still using pounds and inches.]
  4. Sofie

    Sofie Guest

    An older cap that is marked .003 MFD = .003 uF = 3000 pF etc, etc.
  5. Your cap is rated in microfarids. This is a standard from back then.
    Take care for the outside foil, and for the voltage rating when
    replacing it.

    Jerry G.
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