Re: Mother Very Easily ...
- From: Wim Lewis <wiml@xxxxxxxx>
- Date: Fri, 23 Dec 2005 11:24:57 +0000 (UTC)
In article <20051216.0854.105599snz@xxxxxxxxxxxxxxx>,
David G. Bell <dbell@xxxxxxxxxxxxxxx> wrote:
>On Friday, in article <dntcfu$q5k$1@xxxxxxxxxxxxxxxxx>
> sethb@xxxxxxxxx "Seth Breidbart" wrote:
>
>> In article <dnqth7$l2c$1@xxxxxxxxxxxxxxxx>,
>> Keith F. Lynch <kfl@xxxxxxxxxxxxxx> wrote:
>>
>> >You'll probably find a bimodal distribution, with some 10% to 20% high
>> >and others 10% to 20% low. The ones that happen to have close to the
>> >correct value were repackaged as higher accuracy resistors.
>>
>> Why not repackage a 19% high 500-ohm resistor as a 1% 600-ohm
>> resistor?
>
>Stock control, I reckon. There's a set of standard values, and I don't
>know just how that was devised.
It's devised so that:
1) the range fills a power of ten and then repeats; and
2) there aren't any gaps.
That is, the standard values for 5%-tolerance resistors are about 10% apart,
so that any random value you pick will be within the tolerance of one
of the standard values.
The EIA has a bunch of scales, from six per decade (for 20% tolerance
components) up to ... (google google) wow, 192 per decade.
Anyway, this leaves Seth's question unanswered. I've heard,
anecdotally, that the bimodal distribution Keith describes did/does
exist. I can only speculate that some values are in higher demand
than others, or something like that.
--
Wim Lewis <wiml@xxxxxxxx>, Seattle, WA, USA. PGP keyID 27F772C1
.
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- Re: Mother Very Easily ...
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- Re: Mother Very Easily ...
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