From: John Woodgate
Subject: Re: what is 100R mean in a schematics?
Date: Fri, 3 Jan 2003 13:14:34 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Fri, 3 Jan 2003 15:12:07 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Chris Ainslie <email@example.com>
wrote (in <firstname.lastname@example.org>) about 'what is 100R mean in a
schematics?', on Fri, 3 Jan 2003:
>Ok, on that note, I have a question....I'm not very clued up here!
Indeed. But we can help.
>I was recently constructing a kit for an electric fence and the schematic
>told me where C3 and C4 should go and that C3 was a 22uF ceramic cap and C4
>was a 220uF ceramic cap.
Either they are not ceramic or the values are wrong. While ceramic
components of those values may be available at a price, they are very
special and would not be used in an electric fence controller.
>Now, one of them was a tiny yellow one with a shiny coating and had the
>number 224 on it.
That is 220 000 pF = 220 nF = 0.22 uF.
>The other was one of those orange disc type ones with a
>matt finish and on it, it said 223Z.
That is 22 000 pF = 22 nF = 0.022 uF. The 'Z' describes the tolerance,
which is +80/-20%
The physical descriptions are consistent with the parts being ceramic
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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