AW: [sdiy] AD/DA schematics? quantizers,etc

[Dan Snazelle]

ok

in the current setup, the quantatizing (sp?) seems to be working better BUT and this is a big BUT....
When DRIVING a VCO....it is sounding more like a sample and hold than a quantizer.

and what i mean by this is that if i feed in a very low freq sawtooth what i get out of the vco sounds like  a series of notes with steps in between very very similar to a sample and hold fed by a white noise and fed into a vco



is this due to what fonik was mentioning? he noted that he needed to put latches on the output of the DAC so that there was a smooth flow between notes


or maybe i have done something wrong again


all in all it is a cool sounding effect but not quite the sound i had been going for.


i do not know even how to setup a latch on the out...what would control it?

the clock? a bit from the A to D?

thanks






----------------------------------------
> From: jerryge at cableone.net
> To: synth-diy at dropmix.xs4all.nl
> Subject: RE: AW: [sdiy] AD/DA schematics? quantizers,etc
> Date: Fri, 15 May 2009 08:55:57 -0500
>
> <
>> The note C3 should be exactly 0 V. The note C#3 should be 0.83333 Volts.
>>>
>
> Yes this is most of it, the other thing is that Where the voltage changes
> relative to the input voltage is important to prevent the output voltage
> from varying due to Bit Toggle.
>
> For example if note C3 is exactly 0 V and your Output step voltage is
> 0.83333 Volts the Input voltage range that gives you the C3 output should be
> +- 1/2 step or -0.41666...Volts to +0.41666...Volts.
> This is what I mean by Centered on the Step.
>
>
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of
> Matthias.Herrmann at jeppesen.com
> Sent: Friday, May 15, 2009 4:09 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: AW: [sdiy] AD/DA schematics? quantizers,etc
>
>
> synth-diy-bounces at dropmix.xs4all.nl wrote on 05/15/2009 10:57:41 AM:
>> Hello Matthias
>>
>>> i am not quite sure if i understand (due to my poor english). what do
> you
>>> mean by "transition right on the note"?
>> The note C3 should be exactly 0 V. The note C#3 should be 0.83333 Volts.
>
>> The note D3 should be 1.66666 Volts. The note H2 should be -0.83333
>> Volts, and so on....
>>
>> While you only concentrated on the relative step-width, he focuses the
>> absolute voltage. But this can be handled easily by an follwing voltage
>> offset.
>
> i see!
> thanks for clarification.
>
> cheers,
> matthias
> ___
> www.fonitronik.de
>
>>
>> Florian
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