Interpolating scanner (was [sdiy] Multi-source crossfader)

Karl Ekdahl elektrodwarf at yahoo.se
Fri Feb 6 03:55:26 CET 2009 

Hi list

As i'm doing a thing for monies i decided to try and make my own circuit from scratch so as to not screw anyone over with copyrights etc. Interestingly enough i managed to come up with a circuit very different from the other ones i was sent. If anyone's interested i might put a schematic up or something.

Btw. i realized today that through the course of ~2 days work i've made a filter, a couple of VCAs and an interpolating scanner, all from scratch. The fact that i can do this now 100% because you awesome people on this list, i've been subscribed since 1996 (i think?) and all i know of electronics is because of you, so THANK YOU.

Karl


--- Den tors 2009-02-05 skrev Kyle Stephens <lightburnx at yahoo.com>:

> Från: Kyle Stephens <lightburnx at yahoo.com>
> Ämne: RE: [sdiy] Multi-source crossfader
> Till: "Synth-DIY" <synth-diy at dropmix.xs4all.nl>
> Datum: torsdag 5 februari 2009 18.15
> Yeah, everything post the VCDO would be analog.
> 
> Another question: what kind of prom would I use? (And
> I'll worry about how it'll get burned when it comes
> to that...)
> 
> 
> _Kyle
> 
> 
> --- On Wed, 2/4/09, Scott Nordlund
> <gsn10 at hotmail.com> wrote:
> 
> > From: Scott Nordlund <gsn10 at hotmail.com>
> > Subject: RE: [sdiy] Multi-source crossfader
> > To: synth-diy at dropmix.xs4all.nl
> > Date: Wednesday, February 4, 2009, 3:32 PM
> > I doubt 16 bit waveforms would make a huge
> improvement. 
> > Since you're (presumably) only going to be storing
> > full-scale raw waveforms, and doing any amplitude
> processing
> > and crossfading either in the analog domain or with
> > higher-bit digital, 8 bits shouldn't really be
> that much
> > of a limitation.
> > 
> > ----------------------------------------
> > > Date: Wed, 4 Feb 2009 12:19:58 -0800
> > > From: lightburnx at yahoo.com
> > > Subject: Re: [sdiy] Multi-source crossfader
> > > To: synth-diy at dropmix.xs4all.nl
> > >
> > > Funny this comes up, as I got on the topic of
> vector
> > synthesis (mentioned on one of JH's scanner
> project
> > pages) a few days ago.
> > >
> > > I picked up an old motor speed controller at a
> surplus
> > shop a while back - it's got a nice sloped case,
> about
> > 12" x 8", with a center-returning joystick
> in the
> > middle. I gutted out the board and was left to wonder
> how to
> > best make use of it. After some "research"
> (see:
> > Wikipedia jumping), the idea of shuffling through
> wavetables
> > sounds like a great way to wring the most variety out
> of the
> > two axises of a joystick, a la vector synthesis, ie:
> the
> > Sequential Circuits Prophet VS.
> > >
> > > Apart from reading up on the Prophet VS and its
> vector
> > interface, I've looked at some existing DIY
> > implementations of wavetables, namely those of Ken
> Stone
> > (http://www.cgs.synth.net/modules/wavetable.html), and
> Keith
> > Winstanley (http://home.freeuk.net/lowpass/VCDO.html).
> > There's a .zip available on Keith's page of
> the
> > original Digisound VCDO module from which both are
> based.
> > >
> > > I'm curious about what kind of modern
> upgrades
> > could applied to this kind of design. 64-bit eproms
> would be
> > a bit overkill, but even trying a 16-bit would have
> some
> > more room for variety with the wavetables (versus the
> > original 8). If I want to get back to that lofi
> character, I
> > could just drop address lines into the DAC. And if
> nothing
> > else, a newer eprom would suck less juice - the ones
> > prescribed for the Digisound one took up to 500mA
> (yes, half
> > an amp!).
> > >
> > > All this being said, I get the general theory of
> the
> > process, less so the specifics of implementation.
> I've
> > been tackling the VS service manual
> > (http://www.retrosynth.com/docs/pvs/), and some of
> National
> > Semiconductor's application notes on DACs - any
> other
> > suggested reading?
> > >
> > >
> > > It's interesting that I pass by
> Sequential's
> > address listed in the service manual (3051 North First
> > Street, San Jose, CA, USA) on my way to school :3
> > >
> > > And Google Maps says Sequential still has a space
> > there:
> > >
> > >
> >
> http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=3051+N+First+St.,+San+Jose,+CA,+usa&sll=37.394539,-121.934209&sspn=0.007825,0.013819&g=3051+N+First+St.,+San+Jose,+CA,+usa&ie=UTF8&ll=37.396107,-121.934187&spn=0.007825,0.013819&z=16&iwloc=r0
> > >
> > >
> > > _Kyle
> > >
> > >
> > > --- On Tue, 2/3/09, JH.  wrote:
> > >
> > >> From: JH. 
> > >> Subject: Re: [sdiy] Multi-source crossfader
> > >> To: elektrodwarf at yahoo.se,
> > synth-diy at dropmix.xs4all.nl
> > >> Date: Tuesday, February 3, 2009, 11:18 PM
> > >>
> >
> http://www.jhaible.heim.at/interpolating_scanner_and_scanvib/jh_interpolating_scanner_and_scanvib.html
> > >>
> > >> JH.
> > >>
> > >> ----- Original Message -----
> > >> From: "Karl Ekdahl" 
> > >> To: 
> > >> Sent: Tuesday, February 03, 2009 10:44 PM
> > >> Subject: [sdiy] Multi-source crossfader
> > >>
> > >>
> > >> Hi list, i'm in need of a multi-source
> > crossfader,
> > >> specifically i'm going to
> > >> have a fader going inbetween four waveforms
> > (square, saw,
> > >> tri, sine). I
> > >> started designing some kind of
> BTJ-contraption but
> > figured
> > >> perhaps someone
> > >> here already made one?
> > >>
> > >> Thanks
> > >>
> > >> Karl
> > >>
> > >>
> > >>
> > >>
> >
> __________________________________________________________
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> > >>
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