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/iframe></center><br><br> <br><br> </center> </td></tr> </table> <center> <table> <tr> <td width="600"> <center><hr width="400"><font size="2"><b>The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Usenet Archive Feeds Directly<br>From The Open And Publicly Available Newsgroup<br>Sci.Electronics.Design<br><br>This Group And Thousands Of Others Are Available<br>On Most IS NNTP News Servers On Port 119.<br><br><a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Is NOT Responsible For Any Topic,<br>Opinions Or Content Posted To This Or Any Other<br>Newsgroup. This Web Archive Of The Newsgroup And<br>Posts Are For Informational Purposes Only.<br><br></b></font><hr width="400"></center> <center><font size="2"><pre><b> From: John Woodgate <jmw@jmwa.demon.contraspam.yuk> Newsgroups: sci.electronics.design Subject: Re: want a list of R value E6 E12 E24 E48 E96 Date: Mon, 11 Nov 2002 22:02:02 +0000 Organization: JMWA Electronics Consultancy Message-ID: <5wnbKyBajC09EwpE@jmwa.demon.co.uk> References: <3DCC0BE7.BEDAFF5@fanwap.com> <v48osu86rr01reo5btq252t29tgil4840f@4ax.com> <aqhbpr$69m$1@newsg4.svr.pol.co.uk> <aqhits$9to$1@newsg3.svr.pol.co.uk> <aqhk38$90e$1@thorium.cix.co.uk> <aqhn4f$b4e$1@newsg4.svr.pol.co.uk> <aqlhef$9e7$1@thorium.cix.co.uk> <aqogs5$bli$1@news6.svr.pol.co.uk> Reply-To: John Woodgate <jmw@jmwa.demon.co.uk> NNTP-Posting-Host: jmwa.demon.co.uk Mime-Version: 1.0 NNTP-Posting-Date: Mon, 11 Nov 2002 23:00:02 +0000 (UTC) X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739> I read in sci.electronics.design that John Jardine <john@jjdesigns.fsnet.co.uk> wrote (in <aqogs5$bli$1@news6.svr.pol.co.uk >) about 'want a list of R value E6 E12 E24 E48 E96', on Mon, 11 Nov 2002: > Well go on then ... . I'm genuinely and honestly interested in knowing how >the E() series were generated. There is scant info' out there and you may be >the keeper of some interesting details. I think we should be told!. The values ARE logarithmic, or a geometric progression, in other words. NO BS. Not much to do with voltage dividers, though; more to do with tolerances. Just take a crude example, a 1.2 kohm +/-10% may be any value between 1.08 kohm and 1.32 kohm. A 1 kohm +/-10% may be any value between 0.9 kohm and 1.1 kohm. A 1.5 kohm +/-10% may be any value between 1.35 kohm and 1.65 kohm. Thus IF your circuit will accept a +/-10% tolerance, one of those values is bound to be OK (there is a small gap between 1.32 kohms and 1.35 kohms, but you can't do better with just two significant figures for the value). If you actually calculate the values for the 10 % series, the ratio should be the 12th root of 10, 1.2115... So you can't get exact 2-figure values if you stick rigidly to that figure. The actual 'preferred values' deviate by more than just rounding in the case of 2.7, which 'should' be 2.6, 3.3, which should be 3.2, 3.9, which should be 3.8 and 4.7, which should be 4.6. It is alleged by a reliable author (Thomas Roddam in Wireless World) that the deviations were chosen to improve colour contrast. (The committee, IEC TC40?, obviously didn't think anyone would be ingenious enough to paint the resistor bodies maroon!) He also shows how to use the log properties (to bases other than 10) to simplify calculations of networks. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! </b></pre></font><hr width="650"><a href="http://www.cyber-spy.com/electo-index.html"><font size="3">Go Back To The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a><br>Usenet Web Archive Index Of<br>The sci.electronics.design Newsgroup</font></a><br><br></center></td><img src="http://cyber-spy.com/cgi-bin/livecntr.pl?0+1+unetsci" width="1" height="1" alt="The Cyber-Spy Toolkit - powerful internet spy software - live police scanners - usenet fbi secrets archive - newsgroup spy electronics archive - search engine spy tools - download TCST today!"> </tr> </table> </center> <center> <br><center><hr size="3"></center> <table width="100%" cellpadding="0" border="0" cellspacing="0"> <tr> <td align="left" valign="top"><small><b><i><a href="http://www.cyber-spy.com/index.html">Cyber-Spy.Com Live Resources</a></i></b></small></td> <td align="right" valign="top"><small> Copyright Alpha Omega Delta,<br> All rights reserved. </small></td> </tr> </table> <center><hr size="3"></center> <br><br> <br><br></center> </body></html>