[sdiy] expo accuracy? or integrator accuracy?, or both?

[Scott Gravenhorst]

DOH!  long thread...  And I'm in a linear world, so I don't think much about
temperature effects.  If there are any temperature effects present in these
non-expo circuits, they are smaller than I'm able to perceive.

=?iso-8859-1?Q?Ren=E9?= Schmitz <uzs159 at uni-bonn.de> wrote:
>Hi Scott,
>
>>Wow.  Well, if I follow the thread correctly, René, you've done this! (and I
>>built [and use] a copy of the circuit).  You put together a very simple VCO
>>using a 4069 gate for an integrator.  For what it's worth in this discussion,
>>I got 9 octaves of linear operation out of such a "poor integrator".  It seems
>>that even a poor integrator is sufficiently accurate for musical use.  For me,
>>it casts doubt on whether the other much smaller influences are worth
>>investigating at all.
>
>Well, that is true of course. And I know that the CMOS integrator can perform 
>over more octaves than that. (I have tried variations of that circuit too.) 
>The question here is not that of sweep range but of possible thermal effects. 
>I'd say by learning how the integrator performs at a lower loop gain one can 
>make a projection whether thermal (or other) dependancies of loop gain will 
>have an influence on oscillator behaviour or not. 
>
>Cheers,
> René
>
>
>-- 
>uzs159 at uni-bonn.de
>http://www.uni-bonn.de/~uzs159
>
> 
>
>

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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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