[sdiy] really basic question .. tolerance

[John L Marshall]

Tim or Harry or Peter,

Please show me an example of two 1% resistors in series or parallel where
the tolerance exceeds 1%. I heard this rule many times but I can't see it.

Complex circuits are another story. I can see how errors accumulate through
gain stages.

I need empirical evidence to be convinced.

Take care,
John
www.sound-photo.com
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----- Original Message -----
From: "Tim Ressel" <madhun2001 at yahoo.com>
To: "diysynth" <diy_list at analog-synth.de>; <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, January 18, 2003 1:32 PM
Subject: Re: [sdiy] really basic question .. tolerance


> Joerg,
>
> That is an optimistic way of looking at it. However
> the worse-case is still the sum. If I'm worrying about
> tolerances, I always look at worse-case.
>
> --tim
>
>
>
> --- diysynth <diy_list at analog-synth.de> wrote:
> > Hi all
> >
> > > tolerance are connected in series that the result
> > will be out of
> > tolerance?
> > >
> > > Add two 100k resistors 101k + 101k = 202k still 1%
> >
> > Sure ? I allways thought, the resulting tolerance
> > gets better with the
> > factor t_res=t_single/sqrt(n), where n is the number
> > of used resistors, and
> > t_single is the tolerance of the single resistor ?
> >
> > Joerg
> >
> >
>
>
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