[sdiy] Random Tone Generator redux

Wed Mar 25 19:02:45 CET 2009

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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