[sdiy] CV Quantizer

[Harry Bissell Jr]

Well, either you check and see on which
phase the counter is incrementing on...

OK I did it for you.  The counter increments on the
negative edge and the 4013 increments on the positive
edge so you do not have to do ANYTHING to the clock...
just hook it up.

I might add that I did not use the LF412 for the
25KHz clock.  It looks like its hooked up to a bipolar
supply so it will go positive and negative... BAD for
those
CMOS inputs. I made a clock from two gates of a 4001
a cap and three resistors. Search for "two inverter
clock" and you'll prlly find a schematic.

At the output of the 4013... keep the .001uF cap and
1K resistor to ground. eliminate the series 1K and
cap to ground.  

You'll need to use the correct output, Q or notQ
I forget which.  Probably the Q output is right.

The comparator changes the data input... which gets
latched one-half clock cycle later. The RC network
on the output makes a one-shot pulse.

H^) harry

--- megaohm <megaohm1 at gmail.com> wrote:

> How to get the other phase of the 25Khz clock? Do I
> simply use an opamp to
> invert it?
> 
> peng
> 
> 
> On 4/13/06, Harry Bissell Jr
> <harrybissell at prodigy.net> wrote:
> >
> > Its 'almost' as easy as that. The secret to making
> it
> > work well, is to run the output of the CV
> comparator
> > (1st TL072 in the lower schematic) into the "D"
> > input of a CD4013, and clock the 4013 with the
> other
> > phase of the 25KHz clock
> >
> > (so the counter increments on one edge of the
> clock.
> > and the 4013 latches the data on the other edge of
> the
> > clock)
> >
> > This allows a little time for the voltage to be
> stable
> > before the S/H locks in the voltage.
> >
> > I have built this one, It works 'ok' without the
> 4013
> > and great with it !
> >
> > H^) harry
> >
> >
> >
> > --- Jackie D <lumberjack at hotbrev.com> wrote:
> >
> > > I´ve found this also :
> > >
> > >
> >
>
http://www.mindspring.com/~clist/resource/circuits/cv_quant.html
> > >
> > > Is it really as asmple as this ? No PCB layout
> > > though....
> > >
> > > /J
> > >
> > > > Look at the quantizer from the Oberhiem
> 2-Voice
> > > sequencer in the
> > > > lower left hand corner:
> > > >
> > > >
> http://www.synthfool.com/schematics/miniseq.jpg
> > > >
> > > > Cheers,
> > > >
> > > > Jeff
> > > >
> > > > -----Original Message-----
> > > > >From: Jackie D <lumberjack at hotbrev.com>
> > > > >Sent: Apr 13, 2006 5:34 PM
> > > > >To: synth-diy at dropmix.xs4all.nl
> > > > >Subject: [sdiy] CV Quantizer
> > > > >
> > > > >I would like to build a quantizer for my 12
> step
> > > analog sequencer
> > > > >
> > > > >Any tips of a good schematic with PCB layout
> ?
> > > > >
> > > > >Regards
> > > > >J
> > > > >
> > > >
> > >
> >___________________________________________________
> > > > >http://www.hotbrev.com - E-postadresser med
> > > attityd
> > > >
> > > >
> > > >
> > >
> > >
> > >
> ___________________________________________________
> > > http://www.hotbrev.com - E-postadresser med
> attityd
> > >
> >
> >
>