Here's the graph of traditional E12 series (blue) versus exact (green):. It's interesting to note that a slightly better straight line is got with several values in the range reduced. 10K becomes 12.115k etc.įor the E24 series, the magic number is the 24th root of ten (not suprisingly) This equals approximately 1.21152766 and is the theoretical ratio the next highest resistor value has to be compared to the current value i.e. There are 24 values in the E24 range.ĮDIT - the magic number for the E12 series is the 12th root of ten. There are 12 values from 10 to 82 hence E12 series. I tried offsetting a few preferred values by +/-1 and the graph wasn't as straight. This, plus the desire for two-significant digits, looks like a good reason. I've plotted the resistor number (1 to 13) against the log of resistance. Due to resistor colour-coding bands on leaded components two-significant digits were preferred and I reckon this graph speaks for itself:.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |