From: John Woodgate
Subject: Re: !! Software to suggest parallel resistor values.
Date: Wed, 6 Nov 2002 08:58:31 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Wed, 6 Nov 2002 11:45:14 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that adrian
wrote (in <463826e2.0211051349.57d365a5@p
osting.google.com>) about '!! Software to suggest parallel resistor
values.', on Tue, 5 Nov 2002:
>Does anybody know of any software that can recommend two parallel
>resistors values for a desired value eg 9.812 K 1/4 Watt 1 percent
I have an excellent program that does that, and series combinations as
well. That's the good news. The bad news is that it runs only on Acorn
You can calculate, using a transposition of the usual parallel resistors
formula. The resistor R that goes in parallel with given R1 to make
given R2 is: R = R1R2/(R1 - R2). You need to try values of R1 only up to
twice the wanted value R2.
You can write an Excel sheet, using the 5% or 1% preferred values, that
gives you the values of every parallel combination of two preferred
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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