[sdiy] Black Magic oscillator cans

[Theo]

Oeps, didn't see this one
Yes the 2.00024MHz seems to make some sence then.

Theo

From: Tim Ressel <madhun2001 at yahoo.com>

> Ingo,
> 
> I ran the numbers on my trusty MICROSOFT spreadsheet
> and got the following maximum errors:
> 
> 2.00024MHz:  +0.069%, -0.0689%
> 2.00000MHz:  +0.057%, -0.0809%
> 
> Of course the relative note-to-note errors stay the
> same...
>  
> --tr
> 
> --- Ingo Debus <debus at cityweb.de> wrote:
> > Tim Ressel wrote:
> > >>BTW, I can't figure out
> > >>how you derived 2,00024 MHz.
> > > 
> > > 
> > > Ask Mostek. That is the frequency for the MK50240
> > TOG
> > > to make A=440. Its probably from a set of divisors
> > > they came up with to meet a certain error spec,
> > and
> > > that's the frequency that works with those
> > divisors.
> > > 
> > > By the by: 50240 divisors:
> > > C   478
> > > C#  451
> > > D   426
> > > D#  402
> > > E   379
> > > F   358
> > > F#  338
> > > G   319
> > > G#  301
> > > A   284
> > > A#  268
> > > B   253
> > > C'  239
> > 
> > The frequency error introduced by these divisors is
> > way way bigger 
> > than that caused by using a 2 MHz clock instead of
> > 2.00024 MHz.
> > 
> > Am I the only one who noticed this? Or did I miss
> > the point completely?
> > 
> > Ingo
> > 
> > 
> 
> 
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