[sdiy] Random Tone Generator redux

Kyle Stephens lightburnx at yahoo.com
Wed Mar 25 19:27:24 CET 2009 

Ah, there we go! Thanks Dan.

The demo's don't break into real glitchcore tempos, but it's nifty alright nonetheless.


_Kyle

--- On Wed, 3/25/09, Dan Snazelle <subjectivity at hotmail.com> wrote:

> From: Dan Snazelle <subjectivity at hotmail.com>
> Subject: RE: [sdiy] Random Tone Generator redux
> To: lightburnx at yahoo.com, "sdiy" <synth-diy at dropmix.xs4all.nl>
> Date: Wednesday, March 25, 2009, 11:02 AM
> 
> 
> here is the link to the MIT design
> 
> 
> http://www.media.mit.edu/physics/pedagogy/fab/electronics/assignment.html
> 
> there is a link toward the bottom to an older one as well
> 
> i recorded samples of both at SOME point last year
> 
> 
> very cool
> 
> but real schematics of both would be great!! or pcbs even
> better!!!
> 
> will this be PRESs N PEEL? or real boards (either would be
> very useful)
> 
> --------------------------------------------
> check out various dan music at:
> 
>  http://www.myspace.com/lossnyc
> 
> (updated monthly)
> 
> http://www.soundclick.com/lossnyc.htm
> 
> 
> 
> http://www.indie911.com/dan-snazelle
> 
> (or for techno) http://www.myspace.com/snazelle
> 
> ALSO check out Dan synth/Fx projects:
> 
> AUDIO ARK:
> 
> www.youtube.com/watch?v=TJRpvaOcUic
> 
> www.youtube.com/watch?v=BqIa_lXQNTA&feature=channel_page
> 
> www.youtube.com/watch?v=V4nJPjGgOcU&feature=channel_page
> 
> 
> 
> 
> 
> > Date: Wed, 25 Mar 2009 09:51:21 -0700
> > From: lightburnx at yahoo.com
> > Subject: RE: [sdiy] Random Tone Generator redux
> > To: synth-diy at dropmix.xs4all.nl
> >
> >
> > That's another good idea, having the board in and of
> itself have a degree of modularity. There's potential to
> cook the random tone gen, some variation on that, or a bend
> matrix... lot's of possibilities.
> >
> > You'll get more harmonic content with sawtooth (teeth?
> heh) waves. The 4046/4024 waveshaper will do that for you,
> though the standard square out could be put into an external
> VCO's sync, kinda expanding your palette.
> >
> > This is based off an MIT design, right? I can't find
> the link myself now, but I recall there were two samples on
> the page for it...
> >
> >
> > _Kyle
> >
> > --- On Wed, 3/25/09, Ian Smith wrote:
> >
> >> From: Ian Smith
> >> Subject: RE: [sdiy] Random Tone Generator redux
> >> To: "synth diy"
> >> Date: Wednesday, March 25, 2009, 7:25 AM
> >>
> >> Hey all,
> >>
> >> I think to keep feature creep down to whatever
> people feel
> >> comfortable with I'll set up the board so you can
> include or
> >> omit ins and outs as you prefer. I'm kinda
> wavering on the
> >> suboscillator on the output because of the low
> range
> >> switch.
> >>
> >> I'm thinking about putting the external clocks
> after
> >> Schmitts B and C using switched jacks normalized
> for the
> >> internal clocks so you disconnect the internal
> clocks by
> >> plugging into the jack. the question is, would
> anything work
> >> to clock the 4051s or do I need to put something
> in to
> >> convert an external signal to a 0/+5V square
> wave?
> >>
> >> Definitely using the transistor VCA, again with
> either an
> >> internal modulation using another Schmitt trigger
> or with an
> >> external input.
> >>
> >> Outs from the clocks (schmitts B and C) with
> possible
> >> switches to allow clock through from the external
> clock
> >> jacks.
> >>
> >> I feel obliged to have an output level control
> because most
> >> existing modules don't have input level controls,
> except
> >> maybe some filters that have built in mixers
> (MFOS). This
> >> brings up another qiestion of a module of
> multiples that
> >> have attenuators before every out....
> >>
> >> If this was a stand alone unit, I would be tempted
> to add a
> >> filter or two, but as this is intended for a
> modular unit,
> >> no filter.
> >>
> >> How do people feel about it outputting two or
> three
> >> different waveforms?
> >>
> >> As for sound... I have to admit haven't
> breadboarded this
> >> incarnation of the thing yet, but the last one I
> did which
> >> had 4020s instead of 4024s was rather trilly
> between a few
> >> of the notes depending on how the clocks were set.
> I'm going
> >> to try to get this version breadboarded sometime
> next week
> >> because this week is a little hectic.
> >>
> >> -Ian
> >>
> >>> Date: Tue, 24 Mar 2009 22:16:43 -0700
> >>> From: lightburnx at yahoo.com
> >>> Subject: RE: [sdiy] Random Tone Generator
> redux
> >>> To: synth-diy at dropmix.xs4all.nl
> >>>
> >>>
> >>> I've been talking to Ian off list, and thus
> far we
> >> got:
> >>>
> >>> -4024 as a suboscillator on the output;
> individual
> >> outs and/or summed staircase out
> >>> -The bigger divisions off the 4024 can work as
> CV or
> >> gates
> >>> -Spare Schmitts modulating existing Schmitts
> A, B, or
> >> C with Vactrols
> >>> -MFOS WSG tricks, like a transistor VCA
> >>> -Multiple, buffered taps out from within the
> circuit,
> >> pending they give dramatically different enough
> outputs
> >>> -External clock/line in (again, to Schmitts A,
> B, or
> >> C), not unlike this guitar FX design here:
> >>> http://www.geocities.com/tpe123/folkurban/fuzz/pwm.gif
> >>>
> >>> As for a dirt simple filter, maybe a rotary
> switch
> >> with various cap values on the output. I reckon
> it'd keep
> >> feature creep down (not that it hasn't been
> chugging along
> >> already) to let an external filter do the work.
> >>>
> >>> And by way of waveshaping, there's some
> interesting
> >> stuff to be had here:
> >>>
> >>> http://www.geocities.com/picsynth/sawtooth.jpg
> >>>
> >>> Main site: http://www.geocities.com/picsynth/
> >>>
> >>>
> >>> Indeed, I'm curious how the beast sounds as is
> too!
> >>>
> >>>
> >>> _Kyle
> >>>
> >>> --- On Tue, 3/24/09, Colin Hinz  wrote:
> >>>
> >>>> From: Colin Hinz
> >>>> Subject: RE: [sdiy] Random Tone Generator
> redux
> >>>> To: "synth diy"
> >>>> Date: Tuesday, March 24, 2009, 9:26 PM
> >>>> On Mon, 23 Mar 2009, Ian Smith
> >>>> wrote:
> >>>>
> >>>>>
> >>>>> Hi all,
> >>>>>
> >>>>> Here's a link to a schematic that I
> drew up
> >> for that
> >>>> pseudo-random tone
> >>>>> generator.
> >>>>>
> >>>>> http://www.sdiy.org/modius13/randtonereduxschem.pdf
> >>>>
> >>>> Interesting! How does it sound?
> >>>>
> >>>>> If there's anything anyone can think
> of to add
> >> to it
> >>>> feature-wise
> >>>>> that would make it a decent module,
> I'm open
> >> to
> >>>> suggestions.
> >>>>> (trigger outputs, different
> waveforms,
> >> multiple voices
> >>>> in one
> >>>>> package, etc.)
> >>>>
> >>>> Output level control, with perhaps some
> dumb
> >> simple
> >>>> waveshaping or
> >>>> filtering?
> >>>>
> >>>> - Colin
> >>>>
> >>>>
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> >>>>
> >>>
> >>>
> >>>
> >>>
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