[sdiy] Midi2cv with at least 8 channels .. ?

[Seb Francis]

Hi Rob,

I did think of this, but I couldn't fine any S&H arrays from my normal suppliers - maybe I was searching for the wrong name.  Can anyone recommend any?

It makes the programming a bit trickier since the S&H must be frequently refreshed in sequence to avoid noticeable droop.

There are also multi channel D/As with S&H and built in sequencer/refresh logic, but these seem not so common, and I've yet to find a non-SMT one.

Cheers,
Seb




Rob B wrote:

> Why not get a pic with a 12bit d/a built-in and mux it to a sample and hold
> array? I mean, its tried and true technology, and its not very hard.
>
> Saves lots o $$$.
>
> Rob
> ----- Original Message -----
> From: Seb Francis <seb at is-uk.com>
> To: Micke Askernäs <micke.askernas at staff.spray.se>
> Cc: <synth-diy at dropmix.xs4all.nl>
> Sent: Wednesday, September 18, 2002 10:20 AM
> Subject: Re: [sdiy] Midi2cv with at least 8 channels .. ?
>
> > I'm designing one at the moment (16 channels + 4 gates).  It will be based
> around a PIC and MAX525BCPP 12bit D/As.  These Quad-D/As are relatively
> cheap, but accurate enough (+/- 1 LSB) for pitch control over a full 10V
> scale.  The have a serial input, so routing of the digital signals well away
> from the analog signals should be easier.
> >
> > The D/As only give a max 5V full scale output which I plan to double with
> an Op Amp (running on the main +/- 15V supply).  [D/As with higher voltages
> are too expensive.]  I haven't looked at which Op Amps to use yet .. does
> anyone have a recommendation for an accurate DC Op Amp?
> >
> > I'll post the schematic/PCB somewhere when it's built and tested.
> >
> > Seb
> >
> >
> > Micke Askernäs wrote:
> >
> > > Hello!
> > >
> > > I've seen parts of some different midi2cv converters on the web, but
> none
> > > conclusive ... Anyone on here who have any schematics or can recommend a
> > > good kit .. ?
> > >
> > > I need to have at least 8 CV channels, but more is preferable .. I saw
> > > something with 24 outputs on synthdiy.com (photo of a pcb with
> components on
> > > it) .. Anyone know anything about this?
> > >
> > > Thanks,
> > > //Micke
> >
> > --
> >
> > *======================*
> >  p: +44 (0)1242 694 123
> >  m: +44 (0)7876 020 587
> > *======================*
> >
> >

--

*======================*
 p: +44 (0)1242 694 123
 m: +44 (0)7876 020 587
*======================*