[sdiy] parts watch

[Tim Ressel]

Yo,

Well, semi-sharp eyes. Closer examination shows the
0805 +3300 resistors top out at 1.8K. This would
require a slight change in an expo convertor that
calls for 2K. The price is 6.31 for 10.

--Tim


--- Ian Fritz <ijfritz at earthlink.net> wrote:
> Hi Tim --
> 
> Holy cow, how did we all miss that!
> 
> Yes, +3350 is what you need to exactly compensate a
> converter.  With the 
> 10% TC tolerance you will get at most about 250
> ppm/K scale drift.  This is 
> good enough for most people, although a number of
> crazy folks like me are 
> trying to get below 100 ppm/K.
> 
> I would recommend the higher wattage (0805 profile)
> to minimize any 
> possible self-heating effects.
> 
> You could also get the 3900 ppm/K devices and trim
> the tempco to the exact 
> value with a series non-tempco resistor.
> 
> The only problem people might have is that the
> minimum order is listed as 
> 10 pieces.
> 
> Many thanks, Mr. Sharp-Eyes!
> 
>    Ian
> 
> 
> At 12:05 PM 4/28/2003, Tim Ressel wrote:
> >Yo,
> >
> >I just noticed in the new Digikey catalog some
> >Panasonic temco resistors. Sadly they are only
> >positive temco, but they have +3300PPM resistors.
> Are
> >these useable somehow???
> >
> >Catalog T032 Page 758
> >
> >--Tim
> >
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