[sdiy] AD/DA schematics? quantizers,etc

Dan Snazelle subjectivity at hotmail.com
Wed May 13 19:52:56 CEST 2009


awesome



>
> Actually varying the clock rate could be the most interesting effect of all,
> and if you use a Square Wave VCO it is already under voltage control..
>
> The data sheet specifies a clock rate of 10 kHz to 1280 kHz, however you MAY
> be able to use slower clock rates without damaging anything, If the Chip
> starts to heat up or stops converting at lower rates its a NO-GO, I suspect
> that this will not happen, but no guarantee
>
>
> <>
> The 40106 data sheet states:
> TTL compatibility Fan out of 2 driving 74L or 1 driving 74LS
>
> So you should be good, Yes.
>
>
>
>
>
> -----Original Message-----
> From: Dan Snazelle [mailto:subjectivity at hotmail.com]
> Sent: Wednesday, May 13, 2009 12:16 PM
> To: jerryge at cableone.net; sdiy
> Subject: RE: [sdiy] AD/DA schematics? quantizers,etc
>
>
>
> thank you so much!!! this is the kind of info i have been looking for.
>
> i am going to print this out
>
> so i suppose one bad thing about the ADC0808 is that it needs a clock
>
> the adc0804 does not?
>
> can i use a 40106 clock driven from +5 and grnd?
>
> ----------thank----------------------------------
> 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: synth-diy at dropmix.xs4all.nl
>> Subject: RE: [sdiy] AD/DA schematics? quantizers,etc
>> Date: Wed, 13 May 2009 11:40:15 -0500
>>
>> 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
>>
>>
>> --------------------------------------------
>> 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 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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