[sdiy] AD/DA schematics? quantizers,etc

Thu May 14 01:39:11 CEST 2009

oh and what should my in and out opamps be powered off of? i usually use + or - 15 or 12

will that still work in this system?

it gets confusing with all the vrefs and swing limitations

thanks

>
>
>
> i know this is a simple question but to gurantee a 0 to 5 volt swing on the input, is it best to limit the swing with a voltage divider or to just use an opamp with the signal on the non-inverting side and an offset with one side going to +V through a resistor and the other side going to ground?
>
> i have never had to limit the swing of a signal before
>
> 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
>
> and soundtrack/design work:
>
> NEW: check out Dan's sound design from the 1998 award winning film SAFARI by catherine chalmers
>
> http://www.catherinechalmers.com/videos.cfm
>
>
>
>
>
>
> ----------------------------------------
>> From: jerryge at cableone.net
>> To: subjectivity at hotmail.com
>> Subject: RE: [sdiy] AD/DA schematics? quantizers,etc
>> Date: Wed, 13 May 2009 11:48:56 -0500
>>
>> Oh and you can get another effect by varying the Clock rate, the slower it
>> runs the more Chucky the conversions sort of like a bad low pass filter as
>> lower rates will kill of higher frequencies.
>>
>> -----Original Message-----
>> From: synth-diy-bounces at dropmix.xs4all.nl
>> [mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of Dan Snazelle
>> Sent: Wednesday, May 13, 2009 11:27 AM
>> To: gsn10 at hotmail.com; sdiy
>> Subject: RE: [sdiy] AD/DA schematics? quantizers,etc
>>
>>
>>
>> oh and by the way, if i want to use switches to turn on and off each out of
>> the ADC, what should i do? leave it floating instead of to ground?
>>
>> 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
>>
>> and soundtrack/design work:
>>
>> NEW: check out Dan's sound design from the 1998 award winning film SAFARI by
>> catherine chalmers
>>
>> http://www.catherinechalmers.com/videos.cfm
>>
>>
>>
>>
>>
>>
>> ----------------------------------------
>>> From: gsn10 at hotmail.com
>>> To: synth-diy at dropmix.xs4all.nl
>>> Subject: RE: [sdiy] AD/DA schematics? quantizers,etc
>>> Date: Wed, 13 May 2009 11:58:43 -0400
>>>
>>>
>>> That doesn't look like a good circuit design anyway, since it appears to
>> short the ADC outputs to ground while leaving the DAC inputs floating.
>> Circuit bending really hasn't done the world any favors...
>>>
>>> Anyway, a properly-designed variant of that wouldn't be a bad idea, you
>> could even add a "patch bay" between the inputs and outputs and map the
>> inputs to the outputs any way you want, resulting in some sort of primitive
>> waveshaper that could probably do some sort of frequency multiplication or
>> something. For audio purposes it's probably way too nasty but it might be
>> interesting for CV signals.
>>>
>>> ----------------------------------------
>>>> From: subjectivity at hotmail.com
>>>> To: synth-diy at dropmix.xs4all.nl
>>>> Subject: RE: [sdiy] AD/DA schematics? quantizers,etc
>>>> Date: Wed, 13 May 2009 14:45:44 +0000
>>>>
>>>>
>>>>
>>>>
>>>> check this out:
>>>>
>>>>
>> http://experimentalistsanonymous.com/diy/Schematics/Fuzz%20and%20Fuzzy%20Noi
>> semakers/Digital%20fuzz.bmp
>>>>
>>>> i was going to try and build it as it uses an ADC0808 but he only labels
>> pins up to 20!....so now i dont know if he just didnt touch pins 21-28 or if
>> i have a totally different chip
>>>>
>>>> this is all very confusing!
>>>>
>>>>
>>>>
>>>> i found another schematic that uses an ADC0804 for the input and it seems
>> VERY different than an adc0808 in that it only has a + and a - input instead
>> of 8 multiplexed inputs.
>>>>
>>>>
>>>> in general are the ADC08xxx chips pretty easy to switch for another one
>> in the series? or do i need to just go out and order the ADC0804 if thats
>> what it calls for?
>>>>
>>>> can anyone recommend a good book on AD/DA converters?
>>>>
>>>> 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
>>>>
>>>> and soundtrack/design work:
>>>>
>>>> NEW: check out Dan's sound design from the 1998 award winning film SAFARI
>> by catherine chalmers
>>>>
>>>> http://www.catherinechalmers.com/videos.cfm
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> ----------------------------------------
>>>>> From: subjectivity at hotmail.com
>>>>> To: tom at electricdruid.net
>>>>> Subject: RE: [sdiy] AD/DA schematics? quantizers,etc
>>>>> Date: Wed, 13 May 2009 13:23:39 +0000
>>>>> CC: synth-diy at dropmix.xs4all.nl
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> yes i have actually built quite a few crushers , some of my own design.
>> they are cool but i am looking for something a bit different
>>>>>
>>>>> i suppose what i meant was i was interested in changing BOTH the sample
>> rate AND bit rate of the incoming audio with an AD/DA setup
>>>>>
>>>>> thanks!
>>>>>
>>>>>
>>>>>
>>>>>> Dan,
>>>>>>
>>>>>> One quick comment;
>>>>>>
>>>>>>> i am really trying at first to make:
>>>>>>>
>>>>>>> a sample rate reducer or crusher
>>>>>>
>>>>>> These are quite different, reducing the amount of digital data in
>>>>>> either the X or the Y direction.
>>>>>> For a sample-rate reduction type effect, you should have a look at
>>>>>> Tom Bugs' bugcrusher, although it isn't actually reducing any sample
>>>>>> rates. Rather it's an audio-rate S&H. Still, similar sound.
>>>>>>
>>>>>> A real bitcrusher effect would be generated by sampling the input
>>>>>> with an A/D, then feeding only the most significant bits (you choose
>>>>>> how many) to the output D/A.
>>>>>>
>>>>>> I've got this effect in software on my digital oscillator. It allows
>>>>>> you to reduce the output resolution from 16-bit down to 1-bit. This
>>>>>> is further than anyone really needs to go, but it made the control
>>>>>> easier to do!
>>>>>>
>>>>>> HTH,
>>>>>> Tom
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>> _______________________________________________
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>>>>> Synth-diy at dropmix.xs4all.nl
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>>>>
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