[sdiy] AD/DA schematics? quantizers,etc

[Dan Snazelle]

darn

well so far this does not work as a quantizer

i am not sure why

do i need to remove all in and out caps?

do i need to add a lot of gain at the out to drive the cv hot enough?

do i need to give the DAC a 10 volt ref?

and i give the DAC a 10volt ref and the ADC a 5 volt ref,will things still be ok?

man this stuff is confusing at first but the possibilities seem endless


thanks



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----------------------------------------
> 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
>>
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>