[sdiy] Generating a large number of CV outputs

[Mattias Rickardsson]

brianw <brianw at audiobanshee.com> skrev:

> On Dec 8, 2023, at 6:50 AM, Mattias Rickardsson <mr at analogue.org> wrote:
> > Roman Sowa <modular at go2.pl> skrev:
> >> OTOH I would love to see someone doing 100-outs MUX with single DAC
> >> spitting 16-bit precision at 1Msps
> >
> > That's basically what we do since 2012.
> > 16-bit 1MSPS DAC running at 0.96 MHz, multiplexing its output to 40 CV
> channels, each at 24kHz update rate (no zipper noise in the audio band).
> > Works well, but I wouldn't want to try controlling that DAC/mux timing
> with a microprocessor, or build it on a single-sided board. :-)
>
> One question I have is, "How much reconstruction filtering is necessary?"
>

It was enough with an extra RC link directly after the mux cap, before the
buffer op-amp. Added cost: ~0.008 $ per CV channel.

/mr
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