[sdiy] LM335 for tempco

[harrybissell]

no.  If you work out the WORST case maths... it WILL be worse.

On the other hand, you have only 25% chance of worst case.  The
law of averages says it will probably be better.

Also, two 1K tempcos could be expensive.

Basically, a 1K tempco pairs with a 50K input resistor, the 2K with a 100K
resistor.  Switch the input to 50K and you're golden.  If you feel really bad
about
that, use a voltage follower opamp ???

H^) harry

Paul Perry wrote:

> ----- Original Message -----
> From: "Tim Parkhurst"  Can you just put two 1.0K in series, or do the
> tolerances add
> > to the point where it doesn't work as well as a single 2.0K (assuming
> > you have a 2.0K tempco)?
>
> If you work out the "worst case" maths, you will see that it can only get
> BETTER if you
> put two in series.
> But, in practice, it will be the same.
>
> paul perry Melbourne Australia