[sdiy] Random Tone Generator redux

Ian Smith taciturn_unquiet at hotmail.com
Wed Mar 25 21:16:06 CET 2009 


You got that in one Kyle. I like doing things that don't cost too much and you can get a lot out of. I thought for a few minutes to put something crazy like a 566 in there, but it doesn't fit my way of doing things and there's easier and cheaper ways of getting multiple waveforms.

I'll try and post a revised schematic tomorrow with the updates.

-Ian


> 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  wrote:
>
>> From: Dan Snazelle 
>> Subject: RE: [sdiy] Random Tone Generator redux
>> To: taciturn_unquiet at hotmail.com, lightburnx at yahoo.com, "sdiy" 
>> 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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>>>>>
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