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kicad-source/pcb_calculator/eseries_help.md
Jeff Young c0e0cbceb0 Move eseries helper class to common. 
Also improves some terminology for english-speakers.

Also substitues [] vector access (which creates empty elements) over
at() (which throws if the item is not found).
2022-12-29 18:05:57 +00:00

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E-series are defined in IEC 60063.

Available values are approximately equally spaced in a logarithmic scale.

E24(5%):  1.0 1.1 1.2 1.3 1.5 1.6 1.8 2.0 2.2 2.4 2.7 3.0 3.3 3.6 3.9 4.3 4.7 5.1 5.6 6.2 6.8 7.5 8.2 9.1
E12(10%): 1.0 1.2 1.5 1.8 2.2 2.7 3.3 3.9 4.7 5.6 6.8 8.2
E6(20%):  1.0  -  1.5  -  2.2  -  3.3  -  4.7  -  6.8  -
E3(50%):  1.0  -   -   -  2.2  -   -   -  4.7  -   -   -
E1     :  1.0  -   -   -   -   -   -   -   -   -   -   -
  • This calculator finds combinations of standard E-series (between 10Ω and 1MΩ) to create arbitrary values.
  • You can enter the required resistance from 0.0025 to 4000 kΩ.
  • Solutions using up to 4 components are given.

The requested value is always excluded from the solution set.
Optionally up to two additional values can be excluded in case of component availability problems.

Solutions are given in the following formats:

R1 + R2 +...+ Rn	resistors in series
R1 | R2 |...| Rn	resistors in parallel
R1 + (R2|R3)...		any combination of the above