To All, I have posted the program in a zip file in the Files Section of the EMC-PSTC Forum web site. The zip file contains the executable and is only 25 kB in size. To find it, log in to the Forum and on the left side of the home page, scroll down and click on the Files menu. I placed the file in the General folder.
Regards, Scott Douglas EMC-PSTC Admin Scott B. Lacey wrote: > Peter and list members, > > Related to this subject, many years ago one of > the electronics magazines published (in text > format) a Basic program by Jan Axelson that > calculates standard resistor values for any > desired ratio. Either 5% or 1% values can be > calculated. > > Some years later I compiled it into a small (less > than 40k) DOS executable using PowerBasic. > > I still have the program. If someone has space > on a web site or other means to make it > available to list members I would be glad to > email them a copy. I don't have the means to > send it to lots of people if there were a huge > response. > > Scott B. Lacey > > On 13 Mar 2007 at 8:24, Tarver, Peter wrote: > > >> An off-topic question that hopefully someone can shed a little light >> upon. >> >> I have wondered for as long as I've been involved in things electrical, >> why standard component values are what they are. Text books are of no >> use and I've done more than a few internet searches on this in the last >> ten years (or so; maybe I've used the wrong search terms, but I haven't >> found an answer). I'm interested to hear what others might know or >> think about this arcane topic. >> >> It's probably lost to history now, but it may well be based on some >> limitations of physical characteristics of early devices or one >> manufacturer dominating the early production of components and they had >> some idea that they could sell more components if they were in strange >> increments. Or maybe there's a mathematical reason that hasn't occurred >> to me, like some arithmetic progression, or even simple phobias or >> prejudices. >> >> Maybe someone gave it the deepest thought and surmised that particular >> values would yield the minimum of mixing of components in >> series/parallel combinations. Maybe they're still laughing from the >> grave. >> >> >> Regards, >> >> Peter L. Tarver >> [email protected] >> >> <<snip >> > - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
