>If you use this 1K 3500ppm TEMPCO resistor, you will NOT want to add theAn interesting note about 3500 tempcos is on one manufacturer's website -
>62 ohm resistor in series. I found that with a 56K 1% resistor, as in
>Ken's schematic, and the 100K 1% resistor in series with the SPAN
>trimmer, it was not possible to tune to 1V/octave (span trimmer all the
>way down to zero was not enough). I had to remove the 62R resistor,
>which was a pain to install in the first place - it required cutting a
>trace. The 62R is supposed to change the tempco to 3300ppm, but I
>haven't noticed a problem.
they claim that the tempco is subject to tollerance issues and usually comes
out a little on the low site - at 3300. In other words, they are spot on in
most cases (from this manufacturer) just as they are.
Ken
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Ken Stone sasami@... or sasami@...
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