Frequency dividers

[Ken Stone]

Have a look at http://kato.sai.com.au/catgirl/synth/modules.html

This divider runs a X2 prescaler, then divides by whole numbers (3,5,7)
giving 1.5, 2.5 and 3.5. 4.5 could easily be added by using the /9
output (done with a 4017). Other ratios are handled using a binary
counter (2024)

Ken


Mitchell Hudson wrote:
> 
>     To tell the truth I am not sure what musical intervals I was trying to get.
> Most often I end up using the frequency divider as a clock and or CV.
>     I was thinking to generate /4 by dividing the /2 by 2 and /6 by dividing
> the /3 by 2. i figured to use one 4013. I have two more knobs to play with so
> these could be any intervals I like. I thought if I could figure out the /1.5 I
> could use that to divide the /3 output to get /4.5. Then I still have one more
> knob to work with which could be anything.
> 
> --M
> 
> Harry Bissell wrote:
> 
> > Hmmm...
> >
> > If im following... you want
> >
> > /1 = fundamental
> > /1.5 = perfect fifth down
> > /2 = one octave down
> > /3 = one octave and a fifth down
> >
> > /4 = two octaves down...
> > /4.5  =  ???    what would that be..
> > /5 = I don't know what musical interval this is. I CAN show you how to get
> > this one
> > /5.5 = ??? what would that be ???
> >
> > The /1.5 uses a special trick. Normally you can only divide by integers. But
> > with some
> > creative clocking (like clock on both rising AND falling edges of the input)
> > it can be done.
> > Its really a divide by three circuit at heart.
> >
> > Now that 4.5... do you mean two octaves and a fifth down ?? is so just
> > divide the
> > /3 output  by 2 that would be a divide by 6 = two octaves and a fifth...
> >
> > If not please tell me what musical intervals you were expecting...
> >
> > BTW: once you have the basic /1 and /1.5, you can use a dual 4 bit counter
> > such as the CD4520 to get /2 /4 /8 /16 functions.  This would give all
> > possible
> > octave and fifth suboctaves up to four octaves down.
> >
> > H^) harry

-- 
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                Ken Stone  sasami at blaze.net.au
                   ** Catgirl Paradise **
               <http://www.anime.net/~kens/>
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