[sdiy] Tempco 2k +3350ppm Group buy

[HA.Synth at t-online.de]

Am Montag 22 Mai 2006 18:45 schrieb Ian Fritz:
> At 09:05 AM 5/22/06, HA.Synth at t-online.de wrote:
> >HI,
> >
> >I have an new offer!
> >
> >
> >2k +3350ppm Tempco for 4,40 EUR (30pc) delivery time 12 weeks
> >1k +3500ppm Tempco for 3,18 EUR (30pc) delivery time 2 weeks
> >1k +3500ppm Tempco for  2,27 EUR (100pc) delivery time 2 weeks
> >Anyone to jump in?
> >
> >And here is my problem. Should i go for +3350 ppm? Due to the tolerance of
> >the
> >tempcos can i overcompensate? As Ryan says its easier to decrease the TCR
> >then to increase. Is +3500ppm good enough or should i take the risk with
> >+3350 ppm ?
>
> What is the % tolerance on the temp coeff?  (3350 +/- what%).  Be careful
> how the tempco is defined, also.  Some companies quote the slope between
> 25C and 100C, rather than the tangent slope.
>
>    Ian

mhm
Forget to mention this. The offer is from the German distributor of 
www.precisionresistors.com. They say 0,05% (PT146) for R I think. Not for 
TCR . There is an tracking chart for the tempco. But the chart divers from 
the drawing and the equation they give.

Harald