[sdiy] really basic question .. tolerance

[epeasant at telusplanet.net]

> That is, of course, better than 1%.
> This estimation doesnt take into account, that 1%
> tolerance means, that
> there is a gauss-distribution of the resistor values with
> a standard
> deviation around 100 KOhm of  (less than) 1 KOhm or so.
> Tis would increase
> this e-mail to some hundred lines.
>
This would likely apply to two randomly chosen resistors, 
but I have found that resistors from the same roll or lot 
are usually very close to *each other* in value. So the % 
error of a network of these resistors would tend to be very 
close to the % error of each resistor, NOT the marked 
value. In other words, the % error will tend not to change 
no matter how many resistors you add.

Take care,
Doug
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The Electronic Peasant

www.electronicpeasant.com