[sdiy] Random Tone Generator redux

Ian Smith taciturn_unquiet at hotmail.com
Wed Mar 25 21:08:41 CET 2009 

Dan,

It should be rather simple to put in a number of extra pads that connect to various points of output and probably some input pads as well. I will however let you trace where they go, but they'll be close to what they correspond to. 

I guess this is the time to ask if there should be an area for experimentation on the board like there is on Ray Wilson's SoundLab?

-Ian

----------------------------------------
> From: subjectivity at hotmail.com
> To: taciturn_unquiet at hotmail.com; synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] Random Tone Generator redux
> Date: Wed, 25 Mar 2009 19:07:12 +0000
>
>
>
> well i like your attitude!
>
> hell with my backlog (due to the baby) i dont know which i would get done quicker!
> most likely i will be buying a few from you
>
>
> OH i forgot to put in recommendations though
>
>
> let me do that before you finish
>
> ok...i always thought these were really powerful circuits
> especially when combined with other things
>
> as a pcb they would be really useful as pesudo random gens
>
>
> but i would hate to get a pcb that is only good for taking an out from One place in the circuit
>
> there are many other fine places in the device to take out gates, cv etc
>
> so just make sure to have some pads at different points along the way...PLEASE
>
> they dont even have to be well marked
>
> 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: synth-diy at dropmix.xs4all.nl
>> Subject: RE: [sdiy] Random Tone Generator redux
>> Date: Wed, 25 Mar 2009 13:40:27 -0500
>>
>>
>> Damn you and your speedy response Dan!
>>
>> I can do real schematics of both of those and post them as well.
>>
>> As for PCBs... I'm going to do a press&peel of my project for my own futzing to make sure the thing works, but I would probably send out teh design and get real PCBs made... Yellow mask... Black silkscreen... f(form) logo
>>
>> In the spirit of SDIY I'll post the top and bottom traces and silkscreen of the board once I make my own. So you can make your own board or get one from me as you choose.
>>
>> -Ian
>>
>> ----------------------------------------
>>> From: subjectivity 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 18:02:45 +0000
>>> CC:
>>>
>>>
>>>
>>> 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
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Synth-diy mailing list
>>>>>>> Synth-diy at dropmix.xs4all.nl
>>>>>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
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