[sdiy] AD/DA schematics? quantizers,etc

Thu May 14 01:32:49 CEST 2009

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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