Rheilly Phoull said:
G'Day All
Can anyone help me out with the formula that calculates the various values
used for the preferred ranges, like say 1% and 5% ??
Regards ........ Rheilly Phoull
Do you mean the different value ranges like E12, E24, etc.? These are
logarithmically spaced, but unfortunately there is no direct formula to
calculate their exact values.
For the E12 series the approximate values can be computed using the formula
10^(n/12), where n goes from 0 to 11. For the general case, the approximate
values for the range Em are given by 10^(n/m), where n = 0,1,2,...,m-1.
If you apply this to the E12 series, you'll see that the values you get are
pretty close to those of the true E12 series, but deviate somewhat in a way
that is more complex than simply rounding the values.
This link may be helpful:
http://www.logwell.com/tech/components/resistor_values.html
Regards,
Costas
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