[sdiy] Black Magic oscillator cans

[Tim Ressel]

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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