[sdiy] AD/DA schematics? quantizers,etc

Wed May 13 18:40:15 CEST 2009

Ok that look like a basic functional setup, but you still need the Clock
signal at about 500 khz or less. This should be a Square wave at TTL levels
i.e. 0 - 5vdc.

A couple of other things: the Ref+ and Ref- is across the 5 volt supply, to
hit Notes this may need to change. Second the Address Lines (ABC) are set
low (GND) this selects analog input 0 only, if you wish to use the other
inputs you can use switches and some resistors to set them to Logic High or
Low individually TABLE 1. Analog Channel Selection in the Data Sheet shows
how this works.

If you setup the DAC0808 as in FIGURE 1. +10V Output Digital to Analog
Converter of its data sheet and connect the A1 - A8 lines to the (Simple
Analog to Digital Converter) D0 - D7 lines ( replacing the LEDS ) you have a
basic quantizer. The nomenclature is mixed in these two schematics the
hookup is A1-D0, A2-D1 A3-D2, A4-D3 etc.  Again, If you want "Notes" you
will need to modify the Vref+ voltage.

Also Important Note the Analog inputs of the A to D cannot be above 5 volts
or below 0. To feed normal 0 to 10vdc you will need to use at least a
voltage divider ( two resistors) an Opamp setup would be a better choice..

You can do bit decimation by disconnecting the lower bits (A1-D0, A2-D1
etc.) Using switches. if you do this use Pull Down (aprox 10K) resistors on
the D to A inputs you disconnect. This may be interesting with an audio
signal.

-----Original Message-----
From: Dan Snazelle [mailto:subjectivity at hotmail.com]
Sent: Wednesday, May 13, 2009 10:58 AM
To: jerryge at cableone.net; synth-diy at dropmix.xs4all.nl
Subject: RE: [sdiy] AD/DA schematics? quantizers,etc

hooray!!!

found the answer

http://eftekasat101.blogspot.com/2008_09_01_archive.html

--------------------------------------------
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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 10:28:36 -0500
>
>
>
> It looks like the Fuzzy ADC0808 is miss labeled, that is likely a
> ADC0801-ADC0805. The ADC0801 - ADC0805 series are setup to Free Run, it
look
> like you need some extra logic or a uProcessor interface to make the
ADC0808
> run.
>
>
>
> -----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 9:46 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] AD/DA schematics? quantizers,etc
>
>
>
>
>
> 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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