[sdiy] Resistor Noise

[Bob Weigel]

Hehe.  Ummm I don't believe..unless lead length is a factor due to a 
noisy environment...that you'll be able to measure any difference in 
noise from two resistors as opposed to one like this.  The noise that 
results from the lattice 'chaos' at a particular temperature 
(temperature being a measurement of atomic/molecular movement on the 
average) is going to be more related to

1) the impedence AS a function of frequency between the points measured
2) the types of materials used in the impedences presented and
3) the area of involvement I'm guessing, since, at a given resistance, 
this variation represents at least the potential to create a wider 
distribution in peaks it would seem intuitive.

So I'd have to guess, if all the resistors are the same wattage and type 
that type that the two would actually present a miniscually increased 
'Johnson noise'.  -Bob

TIm Daugard wrote:

>As long as we're getting back to a basic discussion mode, which is
>noiser:
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>- A 500 ohm resistor (which I would have to order)
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>- Two 1000 ohm resistors in parallel
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>Other than the resistance values, assume the resistors identical.
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>If no one has an answer, I will look up the formulas and do the math.
>
>Tim Daugard
>AG4GZ 30.4078N 86.6227W Alt: 3.7 M
>http://home.sprintmail.com/~daugard/synth.htm
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