10 MFD capacitor

Discussion in 'General Electronics Chat' started by 1-3-2-4, Jun 3, 2012.

  1. 1-3-2-4

    Thread Starter Active Member

    Dec 26, 2008
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    I got myself a little confused I'm trying to convert a 10 MFD cap into uF would it be the same as 10 uF right?
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,645
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    Hello,

    The 10 MFD is probably taken from a very old schematic.
    Nowerdays they would write the 10 μF.

    Bertus
     
  3. 1-3-2-4

    Thread Starter Active Member

    Dec 26, 2008
    194
    1
    The funny thing is it's from a speaker PCB and the speaker is only maybe 6 years old.. that's why I'm confused.. I've only seen those markings on things from the 60's
     
  4. #12

    Expert

    Nov 30, 2010
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    6,754
    Not a problem. People all over this planet just do the best they know how. MFD = uf
     
  5. wmodavis

    Well-Known Member

    Oct 23, 2010
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    150
    Actually to correctly make the conversion from MFD to uF you need to use a slide rule and multiply by the appropriate constant. That constant being 1.0000000.
     
  6. #12

    Expert

    Nov 30, 2010
    16,255
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    You're supposed to put a smiley on when you do that :D
     
  7. crutschow

    Expert

    Mar 14, 2008
    12,988
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    You must have a very long slide rule. Mine is only good to 3 decimal places (perhaps 4 if I squint). ;)

    The old joke back in my early days was that an engineer is one who multiplies 2 x 2 with his slide rule, gets an answer or 3.99 and says "Aw what the heck, I'll round it off to 4.00".
     
  8. wmodavis

    Well-Known Member

    Oct 23, 2010
    737
    150
    But I was dead serious. It works every time. And on my slide rule I can also add. Bet if you try it on yours it will work on yours too with the stipulation that it is limited to adding 2 + 2.
     
  9. Audioguru

    New Member

    Dec 20, 2007
    9,411
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    The speaker with the 10 MFD capacitor might be only 6 years old but the engineer who spec'd the 10 MFD condenser is probably 60 years old and studied electronics using MFD condensers.
     
  10. Lundwall_Paul

    Member

    Oct 18, 2011
    220
    19
    Ah the good old days when hertz was called cycles and multi pin components were 7 and 9 pin vacuum tubes.
     
  11. birgs

    New Member

    Jun 2, 2012
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  12. Wendy

    Moderator

    Mar 24, 2008
    20,765
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    Speaking from experience? :p

    Gawd, I'm 55. Never mind.
     
  13. BSomer

    Member

    Dec 28, 2011
    433
    106
    When I was doing electrical service work for a local contractor I often ran into capacitors marked with a MFD vs the uF. It was generally in HID lighting like metal halide or high pressure sodium fixtures. The first time I came across that I was a little confused and got out my meter to check it. The capacitor I measured was in the microfarad range and not a milifarad or Megafarad, which I knew would be a really BIG capacitor. Capacitors used in HID ballasts are still available with this MFD marking. Some manufacturers are just stuck in their ways and don't want to change. :)
     
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