[sdiy] getting a quantizer to output proper cv

[Dan Snazelle]

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i DID order jung's ic converter cookbook but it wont be here for a week and may be very outdated!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




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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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>