[sdiy] getting a quantizer //SCHEMATIC UP

[Dan Snazelle]

here is a rough schematic of what i am doing:

http://www.flickr.com/photos/13918667@N02/3531051794/sizes/l/

you can see that the input is going through a 104 cap and a voltage offset on the opamp.
the ADC and DAC you can see i am not sure whether to use a +5 or +10 (the adc isnt rated for it in the datasheet but the adc0808 IS)

and then you can see the output stage which has a pot going to grnd and +12 to bring the signal back between 0 and 12 (this may be totally the wrong way to do this)
and maybe then a cap


comments appreciated

thanks for all the help!!!!






--------------------------------------------
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
> Date: Thu, 14 May 2009 11:27:44 +0000
> CC: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] getting a quantizer to output proper cv
>
>
>
>
> you know i keep thinking back to the night we talked about this at your place
>
> it didnt seem like you had an elaborate in or out stage.
>
> so how did you approach getting the voltage first into a 0-5 swing and then getting it back out at 0-10?
>
> also...it sounds like i need to subtract a small amount and then add it back at the out to get the proper amount of note steps? is this correct?
>
> there seem to be very few references i can turn to for solid information on this.
>
> i DID order jung's ic converter cookbook but it wont be here for a week and may be very outdated!
>
> sorry to be a pest
>
> hope you feel better today
>
>
>
>
> --------------------------------------------
> 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 23:50:17 -0400
>>
>> I would think you'd want to use that 10 volt ref and shift your audio
>> to be around 5 volts instead of around ground. You can then shift it
>> back after the converter or just AC couple the output...
>>
>> mark
>>
>>
>>
>> On May 13, 2009, at 11:38 PM, Dan Snazelle wrote:
>>
>>>
>>> ok
>>>
>>>
>>>
>>> i feel like a fool
>>>
>>> in all my reading and testing today i had somehow missed the fact that
>>> on an ADCchip, the vref cant go below grnd (or not much below)
>>>
>>>
>>>
>>> so i am confused. usually when i see a - sign i think of putting the
>>> negative rail. but in this case it seems you pick a top voltage and a
>>> you pick a bottom but that has to be within 0-vref
>>>
>>>
>>>
>>> is this correct? and the vcc is always 5volts?
>>>
>>>
>>>
>>> how high can the vref be?
>>>
>>>
>>>
>>> a few people have mentioned that for cv, i want a 10v vref.
>>>
>>>
>>>
>>> would a high vref be useful for audio as well? or a lower vref
>>> useful even?
>>>
>>>
>>>
>>> thanks
>>>
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>
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