[sdiy] Black Magic oscillator cans

Ingo Debus debus at cityweb.de
Mon Jul 21 15:19:49 CEST 2003


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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