At 05:13 PM 7/31/2004, Bob Barr wrote: > > > >> I've never heard of "E12" and "E24"... This stuff was covered in school many years ago. E3 series 1, 2.2, 4.7 E6 series 1, 1.5, 2.2, 3.3, 4.7, 6.8 E12 series 1, 1.2, 1.5, 1.8, 2.2, 2.7 etc E24 series 1, 1.1, 1.2, 1.3, 1.5, 1.6, 1.8, 2.0, 2.2 etc E6 was 20% tolerance series in the real old days. E12 was 10% tolerance series E24 was 5% tolerance series I try to design with mostly E3 series resistor values where possible. If those won't work, then try to fit in E6 series, then E12, E24, E96. In other words, E96 values are last resort and used only where necessary. This maximizes the chances of some poor field tech being able to quickly get a broken piece of equipment working again with the parts he has on hand or can get locally. Notice that common capacitor values follow the E3 series values. dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 20 years of Engineering Innovation (1984 - 2004) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics