[sdiy] voltage quantizers

[harrybissell at copper.net]

The Chris List design works OK, but it has some problems
imho

The best way to do it is to add a D flip-flop to the comparator
output that clocks on the opposite edge of the counter advance signal.

This way, the analog voltage is stable for 1/2 clock cycle before the
S/H is clocked. This works MUCH better.  I have built this and used
it for a while.

For an 8 channel circuit, you can use one counter and eight S/H...
but the results may be skewed by the number of clock cycles between
latches.

Is that a problem ?

My quantizer uses an A/D - D/A circuit.  But an eight channel would
be messy...

H^) harry
>
>
>---- Original Message ----
>From: mverbos at earthlink.net
>To: synth-diy at dropmix.xs4all.nl
>Subject: RE: [sdiy] voltage quantizers
>Date: Wed, 18 Apr 2007 02:31:59 -0400
>
>>Hi there,
>>
>>I need to build an 8 channel quantizer for a friend. Nothing fancy, 
>
>>just semitone scale, but it must be quick. There has been a lot of  
>>talk about Chris List's ARP style quantizer over the years. Scott  
>>Stites recently did an updated version and had success, but I have  
>>been wondering. How fast is the action on these things?  Would it
>not  
>>be a better solution to multiplex 8 channels around an 8 bit AtoD  
>>followed directly by an 8 Bit DtoA? Has anyone done this? The Buchla
> 
>>MARF does something like this, but using a discrete flash converter.
>  
>>I'd think IC converters would be even faster.
>>
>>Just hoping for some discussion...
>>
>>Mark
>>
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