OK, so, it’s not really that hard to learn to read a resistor without a special tool, but ever since I saw the free downloadable nuclear bomb effects computer I have had a soft spot for these circular slide rules. And this one from Rob Ives might make a cool gift for a young maker to get him or her painlessly over the hump. [Thanks, Rob!]
14 thoughts on “Free Downloadable Resistor Value Computer”
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http://web.mac.com/kxm_ikkei/Site/MAZE_files/MAZE%202C.pdf
Thanks, blogging this!
Just what my workspace needed :)
While you’re on the topic of resistors and sliderules…
From an old posting on the USENET sci.electronics newsgroup….(edited for relevance)
From: Dave Slee
Newsgroups: sci.electronics
Subject: Re: Sliderules (do they still exist?)
Date: Wed, 18 Oct 1995 21:52:16 GMT
Organization: Soil Machine Dynamics Ltd.
[…]
Take your standard slide rule and doctor the scales. Add some new markings: the standard resistor
values:
1, 1.5, 2, 2.2, 3.3, 4.7, 5.6, 6.8, etc. (have I missed a few? so what you get the idea)
Mark them as little dots on the ratio scales.
Now a pair of scales on a slide rule work on ratios. If you want a potential divider that has a 3:7
ratio, put the 3 on one scale against the 7 on the other scale. Now find the pair of dots that come
closest. These are the standard resistor values that are the best approximation to the required
ratio. The error in dot spacing gives you some idea of how far you are out.
[end of quote]
Made a little experiment in HTML5 inspired by this idea:
http://halufa.blogspot.com/2011/02/resistor-value-calculator-in-html5.html
You need to have a non Internet Explorer browser, since it doesn’t support HTML5.
Check out http://www.buythebestpc.com
It reminded me alot of this article!
Helpful advises above. I have noticed that many people are using twitter for marketing. I would love to try this too for my business.
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