[sdiy] Give me an 'A' !!

[jhaible]

In my Minimoog Clone I have used a TOS chip - they weren't as
rare back then. I don't remember the quarz frequency, but I remember
I've used the "C" output instead of "A". Why? It's keyboard-less,
and the Midi/CV converter would put out a "C" with no Midi Signal
attached.

JH.


-----Ursprüngliche Nachricht-----
Von: Tim Ressel <madhun2001 at yahoo.com>
An: Batz Goodfortune <batzman at all-electric.com>; Synth-DIY list
<synth-diy at dropmix.xs4all.nl>
Gesendet: Mittwoch, 16. Oktober 2002 20:31
Betreff: Re: [sdiy] Give me an 'A' !!


> Hey, how about that! first frequency I tried:
>
> 5.0688 MHz / 11520 = 440 Hz.
>
> --TR
>
> --- Batz Goodfortune <batzman at all-electric.com> wrote:
> > Y-ellow Tim 'n' all.
> >
> > At 07:55 AM 10/16/02 -0700, Tim Ressel wrote:
> > >To all,
> > >
> > >I seem to recall the old Moogs had a built-in
> > >calibrator which produced A-440. How was this done?
> > >Was it accurate? Is there a crystal that will
> > divide
> > >down to 440hz?
> >
> > A quick play with the calculator didn't yeild
> > anything exact. Several
> > almost-magic numbers came up but not quite. However
> > the percentage
> > difference may have been negligible. I didn't have
> > time to check.
> >
> > I don't know about how this was done in moogs if at
> > all. However one place
> > I worked needed a strange and somewhat esoteric xtal
> > for some box we made.
> > There was a guy across down who just happened to
> > custom make xtals and all
> > we had to do is bake them. But I don't know the
> > process as I didn't have
> > anything to do with that stuff. But the point is,
> > that back in the 60s,
> > Moog may have considered having custom tuned xtals
> > an economically viable
> > thing to do since this kind of stuff was more common
> > back then. People who
> > make custom xtals were a dying breed back when we
> > were having them made, I
> > don't know if anyone would still do that now? Not
> > here anyway.
> >
> > Of course he could have always electrified a tuning
> > fork Ah Lah Rhodes. :)
> >
> > Be absolutely Icebox.
> >
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> >
>
>
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