Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 4th December 2002, 02:04 PM   #1
diyAudio Moderator Emeritus
 
Bas Horneman's Avatar
 
Join Date: Apr 2002
Location: The Netherlands
Blog Entries: 18
Default 0,0047uF = 47pF?

Sorry for asking such a trivial question...but
is 0,0047uF equal to 47pF???
  Reply With Quote
Old 4th December 2002, 02:07 PM   #2
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
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. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 4th December 2002, 02:07 PM   #3
diyAudio Member
 
Join Date: Mar 2002
Location: Atlanta, GA
Send a message via AIM to Austin
Default nope

.0047uF would be 4.7nF and 4700pF

uF=10^-6
nF=10^-9
pF=10^-12

Austin
  Reply With Quote
Old 4th December 2002, 02:10 PM   #4
diyAudio Moderator Emeritus
 
Bas Horneman's Avatar
 
Join Date: Apr 2002
Location: The Netherlands
Blog Entries: 18
47pf would thus be 0,0000047uF?

Thanks for the replies!
  Reply With Quote
Old 4th December 2002, 02:13 PM   #5
UrSv is offline UrSv  Sweden
diyAudio Member
 
UrSv's Avatar
 
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
  Reply With Quote
Old 4th December 2002, 02:17 PM   #6
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
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. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 4th December 2002, 02:23 PM   #7
diyAudio Member
 
chris ma's Avatar
 
Join Date: Sep 2001
Location: Pickering, Canada
Hi,

Please check the numbers here
Attached Images
File Type: jpg number.jpg (93.2 KB, 357 views)
  Reply With Quote
Old 4th December 2002, 05:25 PM   #8
sam9 is offline sam9  United States
diyAudio Member
 
sam9's Avatar
 
Join Date: Jun 2002
Location: Left Coast
Default 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.
  Reply With Quote
Old 4th December 2002, 05:29 PM   #9
diyAudio Member
 
chris ma's Avatar
 
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
  Reply With Quote
Old 4th December 2002, 05:33 PM   #10
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Default 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
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Find Rhoos compatible 47Pf??? Progg70 Parts 2 31st January 2009 01:58 AM


New To Site? Need Help?

All times are GMT. The time now is 11:22 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2