0,0047uF = 47pF?
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 4th December 2002, 02:04 PM #1 Bas Horneman   diyAudio Moderator Emeritus     Join Date: Apr 2002 Location: The Netherlands 0,0047uF = 47pF? Sorry for asking such a trivial question...but is 0,0047uF equal to 47pF???
 4th December 2002, 02:07 PM #2 jean-paul   diyAudio Moderator Emeritus     Join Date: Sep 2002 Location: Germany No, it's 4.7 nF. Which is the same as 4700 pF. On your calculator: uF is 10 with exponent -6. nF is 10 with exponent -9 and pF is 10 with exponent -12. Note that the international way to express these values is by using a dot instead of a comma. In Europe we write down 4,7 which confuses others. We write down 10.000 for ten thousand whilst the Americans write down 10,000 for the same thing.( If I'm correct ). __________________ It's only audio. Member of the non modular PCB design committee
 4th December 2002, 02:07 PM #3 Austin diyAudio Member   Join Date: Mar 2002 Location: Atlanta, GA nope .0047uF would be 4.7nF and 4700pF uF=10^-6 nF=10^-9 pF=10^-12 Austin
 4th December 2002, 02:10 PM #4 Bas Horneman   diyAudio Moderator Emeritus     Join Date: Apr 2002 Location: The Netherlands 47pf would thus be 0,0000047uF? Thanks for the replies!
UrSv
diyAudio Member

Join Date: Jan 2002
Location: Sweden
Quote:
 Originally posted by Bas Horneman 47pf would thus be 0,0000047uF? Thanks for the replies!
No, it would be 0,000047uF.

/UrSv

 4th December 2002, 02:17 PM #6 jean-paul   diyAudio Moderator Emeritus     Join Date: Sep 2002 Location: Germany Bas, if you use the 0,0000xxx way of noting values errors creep in easily. Try the exponent way of expressing these values on your calculator and your cross over filters will require much smaller caps ( or bigger ) than you calculated before __________________ It's only audio. Member of the non modular PCB design committee
chris ma
diyAudio Member

Join Date: Sep 2001
Hi,

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 4th December 2002, 05:25 PM #8 sam9   diyAudio Member     Join Date: Jun 2002 Location: Left Coast The Cosmic Question is : Who decided on making a Farad so big, anyway? Ocassionally, ones sees a 1F cap used for an autosound system (the one that drives you nuts sitting at a stop light, no doubt). Otherwise, it seems of no use except to microwave a cow or fire up 'ole sparky.
 4th December 2002, 05:29 PM #9 chris ma   diyAudio Member     Join Date: Sep 2001 Location: Pickering, Canada Ah...Far..rad....I remember there used to be a guy around called Faraday, might have been a DIYer too.... Chris
jan.didden
diyAudio Member

Join Date: May 2002
Location: The great city of Turnhout, BE
Re: The Cosmic Question is :

Quote:
 Originally posted by sam9 Who decided on making a Farad so big, anyway? Ocassionally, ones sees a 1F cap used for an autosound system (the one that drives you nuts sitting at a stop light, no doubt). Otherwise, it seems of no use except to microwave a cow or fire up 'ole sparky.
I think they defined it as a cap that gets charged 1 volt by 1 Amp for 1 Sec. They really couldn't predict we would be working with uamps 100 years later, could they?

Jan Didden

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