[sdiy] TEMPCO resister question

[Scott Bernardi]

A 100K over 1.8K divider gives the approximate ratio to drive an
exponential generator at 1 volt per octave (i.e., about 18mV per octave
at the base of the transistor) at 25 deg C.  Typically a 2K tempco is
used, and then a trimpot after this to trim exact 1V/octave response.

IWAKUNI Kaoru wrote:

> Hello list,
>
>  This is my 2nd post from Japan. :-)
>
>  I have a question about the value of anti-log TEMPCO resister.
>  I'm using 2kohm resister now. But, referring to vintage design
>  like ARP ODYSSEY, the value of 1.87kohm is used.
>  Could some one on this list kindly tell me where this odd value
>  come from?
>
>  I have some chip TEMPCO resisters, but it is difficult to mount
>  on prototype PCB, so  I'm going to order lead type TEMPCO resister
>  to one resister manufacturer.
>  But I can't decide I should order 2kohm or 1.8kohm now.
>
>  Please advise. Thanks!
>
> // Kaoru