[sdiy] Random Tone Generator redux

Kyle Stephens lightburnx at yahoo.com
Wed Mar 25 20:50:35 CET 2009 

Naw, not too crazy. That was the multi-tap out idea I had. There would just need to be some poking around to see which points would be the most viable. I can't the Boolean algebra yet, but I bet within the circuit there will be two point having either the same/close eniugh not to matter signal, or something equally benign like a simple inversion.

I'm all for PCBs too! I like that the parts herein are pretty cheap, all ICs less than a dollar each (hell, 50 cents even), at surplus prices.


_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: taciturn_unquiet at hotmail.com, lightburnx at yahoo.com, "sdiy" <synth-diy at dropmix.xs4all.nl>
> Date: Wednesday, March 25, 2009, 12:18 PM
> 
> in case my last post didnt make sense.,.i would buy a bunch
> of these if i thought that
> 
> 1. they had a pad for external clock (and i could worry
> about whether or not your device could handle my clock)
> 2. it had pads at IC2 out say q1, q, etc
> 3, it had some pads out at say ic4 q3, q4,etc
> 4. it had a pad out at ic6a, or i1d
> 
> bascially then i could use these pcbs for all kinds of
> weird duties.
> 
> i use 4024s with 4051's a lot.
> 
> and i think the single most powerful aspect of a board like
> this is how MANY points you can take stuff, useful weird
> stuff, out of it
> 
> 
> does this make any sense?
> 
> maybe this would be too crazy
> 
> thanks
> 
> 
> 
> --------------------------------------------
> 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
> 
> 
> 
> 
> 
> 
> 
> ----------------------------------------
> > From: taciturn_unquiet at hotmail.com
> > To: lightburnx at yahoo.com;
> synth-diy at dropmix.xs4all.nl
> > Subject: RE: [sdiy] Random Tone Generator redux
> > Date: Wed, 25 Mar 2009 13:22:15 -0500
> > CC:
> >
> >
> > Kyle,
> >
> > Yeah, the original is the MIT class project. I trawled
> through the archive to find the links again.
> >
> > http://www.media.mit.edu/physics/pedagogy/fab/electronics/old_assignment.html
> >
> > http://www.media.mit.edu/physics/pedagogy/fab/electronics/assignment.html
> >
> > I'm also going to be posting those links on my web
> page over at sdiy.org so I won't lose the things again.
> >
> > http://www.sdiy.org/modius13/
> >
> > -Ian
> >
> > ----------------------------------------
> >> 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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