[sdiy] Yusynth VCO

[Ian Fritz]

At 12:05 AM 4/5/2010, David G. Dixon wrote:
> > > I get a different result, though.  I must be misunderstanding something.
> > >
> > > The fractional frequency change per degree is 2.27 / 881 or .26% or
> > > 2600ppm/K, is what I get.
> > >
> > > What am I missing?
>
> > You are looking at it linearly instead of exponentially.

No. I am calculating the log derivative. This is simply the definition of 
temperature coeficient:
TC = (1/f)(df/dT) = (d/dT)log f
Please refer to my website for how these calculations are done:
http://home.comcast.net/~ijfritz/sy_cir7.htm

Ian