Hey André,
i am familiar with your website. A tempco with a temp. coeff. of 3500 , 1K 1%, is not so difficult to find. Most moduls of MOTM use a tempco of 3500 ppm (like the MOTM-300) but in the BOM for the 440 & 485 there is specified 1K 1% 3300 ppm.
Elby design delivers a second resitor to lower the temp. coeff. but then you can take also a tempco with a tolerance of 5% from Tyco.
So that is the reason why I ask around for 1K 1% 3300 ppm tempco's.
If it doesn't matter that much I shall use one of 3500 ppm
Peter
--- In motm@yahoogroups.com, Andre Majorel <aym-htnys@...> wrote:
>
> On 2010-05-02 21:48 -0000, peter_ivens wrote:
>
> > i am searching for a supplier for the 1K 1% 3300 ppm tempco as
> > used in the MOTM-440 & 485.
> >
> > Can somebody show me the way?
>
> http://www.teaser.fr/~amajorel/sourcing/#tempcos
>
> Anything with "+3300" or "+3500" in the PPM/K column should do.
>
> --
> André Majorel http://www.teaser.fr/~amajorel/
>