[sdiy] AD/DA schematics? quantizers,etc

Thu May 14 04:20:21 CEST 2009

ok

interesting findings...right now +vref is on 5volts and -v is on ground. for quantizing and such i want a higher vref.

but

when i tried switching the adc0808 positive vref to 12volts, it cut all sound

so i tried putting -v to -12...still no good

so i put em back. but when i put +Vref to grnd, i got some really nice crazy sounds.

but i am wondering why i couldnt use a higher +/- vref? do i need to change them on the DAC0808 as well?

in other words, do i need to use +12 on the dac and adc?

thanks

----------------------------------------
> From: subjectivity at hotmail.com
> To: subjectivity at hotmail.com
> Subject: RE: [sdiy] AD/DA schematics? quantizers,etc
> Date: Thu, 14 May 2009 02:01:46 +0000
>
>
> one other issue seems to be a real loss of bass
>
> drums coming out of the setup are very trebly with very little bass left.
>
>
>
>
>
> --------------------------------------------
> 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: mverbos at earthlink.net; synth-diy at dropmix.xs4all.nl
>> Subject: RE: [sdiy] AD/DA schematics? quantizers,etc
>> Date: Thu, 14 May 2009 01:13:09 +0000
>> CC:
>>
>>
>>
>> so
>>
>> first step is complete and successful
>>
>> i must admit that i am a bit surprised as it doesnt sound too much different than the aliasers i have built with a jfet and a sample and hold.
>>
>> one thing...to get the clock up to 400 khz, what cap value should i be using on my 40106 clock?
>>
>> maybe getting the bit values lower will sound different but so far i dont know if this is really worth it
>>
>> i will say this alleviates the problem of bleedthrough that i get with analog aliases
>>
>> 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
>>
>>
>>
>>
>>
>>
>> ----------------------------------------
>>> CC: synth-diy at dropmix.xs4all.nl
>>> From: mverbos at earthlink.net
>>> To: subjectivity at hotmail.com
>>> Subject: Re: [sdiy] AD/DA schematics? quantizers,etc
>>> Date: Wed, 13 May 2009 20:34:58 -0400
>>>
>>> Dan,
>>>
>>> I'd power your opamp from +/-15 as normal, but after the opamp/before
>>> the AthD put a low valued resistor followed by a diode to +5 and one
>>> to ground. That will limit the signal swing, preventing the AtoD from
>>> being hit too hard. That's standard stuff, a bit like what's inside of
>>> CMOS chips to protect their inputs.
>>>
>>> Mark
>>>
>>>
>>>
>>>
>>>
>>> On May 13, 2009, at 7:39 PM, Dan Snazelle wrote:
>>>
>>>>
>>>> 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
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> Synth-diy mailing list
>>>>>>>>> Synth-diy at dropmix.xs4all.nl
>>>>>>>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>>>>>>>
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