Al Arduengo wrote:

mfd=Microfarads or uF. In other words buy yourself a nice big
electrolytic cap (about 30wvdc for make sure it surives) and put it
across the leads. Get it at Ratshack, or any electronic parts
supplier.


If it says mfd it should mean mili-farads - not micro-farads.


Not in the USA.


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Only metric prefixes for 10+6 or more have an upper-case abbreviation (e.g.,
M = 10+6, G = 10+9, etc.). In particular, note that the prefix m indicates
10-3 and M indicates 10+6. The difference between an upper-case M and a
lower-case m is nine orders of magnitude! One should be warned that American
manufacturers of capacitors often use "mF" or "MF" to indicate microfarads,
a practice that is both incorrect and misleading.

The proper abbreviation for "kilohertz" is "kHz": only the "H" is upper case.

Note that the proper abbreviation for "second" is "s", not "sec".

The same abbreviation is used for the singular and plural form of a unit.

A period is not placed after an abbreviated unit, unless it is at the end of
the sentence.

http://www.rbs0.com/tw.htm

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* mF: Milli-Farad, 1x10-3 Farad (1,000th of a Farad) - uncommon
* uF: Micro-Farad, 1x10-6 Farad (1,000,000th of a Farad)
* mF: Micro-Farad, a very, very old term, still sometimes used in the
US (True!) - Causes much confusion.
* ufd: Micro-Farad, another very old term, still used in the US
* mfd (or MFD): Yet another antiquated term - US again!
* nF: Nano-Farad, 1x10-9 Farad (1,000,000,000th of a Farad) - Common
everywhere except the US
* pF: Pico-Farad, 1x10-12 Farad (1,000,000,000,000th of a Farad)
* mmF: Micro-Micro-Farad, another extremely old term, also still used
sometimes in the US

http://sound.westhost.com/beginners.htm

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mike