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1367

Forum 20052010 (read only) / FrequentlyAsked Questions / Re: Resistors Scale

on: July 02, 2010, 07:05:55 am

I was stuck on thinking round up was rounding down... If you realize i have written it in the first post, but whatever...
Now i understand it, round up to prevent overlap, ok
In the 3.3 case, where you have 3.16 if you round up to 3.2 it is still overlaping so you keep adding 0.1 until you prevent it, is that correct?



1370

Forum 20052010 (read only) / FrequentlyAsked Questions / Resistors Scale

on: July 01, 2010, 04:20:45 pm

Seeming that no one in the Spanish forum has the knowledge to answer this question I will post it here
To get the resistor scales (E12, E24, E48...) you use the following formula:
10^(i/n)
Where n is the scale number (12,24,48...) and n is a natural number from 0 to n
The problem is that when getting the E12 resistor values, the first ones come ok, but when arriving to higher values like 4.7 Ohms, the formula gives 4.64 so even with rounding you can't get the 4.7 value
Rounding up isn't valid as for 3.3 it gives 3.16
Anybody knows why?



