[sdiy] Duh. Major sequencer tuning, realization. :O

[Rykhaard D.A.M.I.A.N.]

On 1/6/06, Ken Stone <sasami at hotkey.net.au> wrote:
>
>
> >12 semitones to an octave.  Right? ;)  12 steps in a rotary switch, for 1
> >semitone PER.  Right?  ;) ;)
>
> No, not exactly. C to C1 is 13 notes (positions), or twelve steps (clicks
> of
> the rotary switch). If you want the oposite ends of the the rotary to be
> one
> octave apart, you need 1 volt across twelve equal resistors, with the top
> position and bottom position the ends of the resistor string.
>
> >This does NOT mean, 12 resistors of the the same value around the rotary
> >switch!  :O
>
> Oh yes it does! Note that twelve resistors = 13 positions - 13 hookup
> points.


That's the point there though.  :)  To have 1 octave worth of notes on the
rotary switch, I'd have to have a 13 position rotary.  :-/  I had mistakenly
hooked the ring of resistors around the rotary switch in the way that, I had
C at position 1, and C1 at position 12.  I.E.  Too many divisions between
the 2 positions.

>It took me a while to realize that the 1st and 12th switch positions are
> >NOT, 1 octave (I.E. - C to C)
>
> This is true. Position 13 needs to be the top C
>
> Ken


True.  Which I can't have, on the multiple of 12 position rotary switches
that I have. :)  I'm just now, trying to figure out how to get the entire
tuning system built, so that I have +1 and +2 octave switches available, for
each of the steps in the sequencer, as well.
Now that I finally have an uninterrupted full day to build, I have enough
time to sit and work that out.  :)

I'm going to keep the 'improperly tuned' sequence that's on my webpage
though - as a humourous portion of the machine's history. ;) LOL


--
Take care,
Warmth and Peace,
Ryk

http://deathlehem.bravehost.com/damian.html - D.A.M.I.A.N.;s webpage - Jan.
0406 update
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