[sdiy] AD/DA schematics? quantizers,etc

[Dan Snazelle]

ok

well one of the reasons i picked this schematic is there are almost NO other audio FX using ADC or DAC chips

now that i found a way to use the ADC0808 as a one input ADC, i will try to redesign this thing



all i am really looking for is a circuit to mess about with audio.

it can sound nasty too. even better if it could mess with CV.



--------------------------------------------
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%20Noisemakers/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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