[sdiy] Multiplexed Expo Converter?

[jhaible at debitel.net]

Pro: mux'ing the EC means linear VCOs -> pleasant low frequency mistracking.
Con: Audio Rate modulation would be a problem.

JH.

> Hi guys,
> This might be relevant to the DIY Polysynths thread going on at the same
> time.
> 
> I heard that Korg used to multiplex the Expo Converters in their
> polysynths. I think it's a pretty good idea to keep things in sync, so
> that even if the EC floats, every part floats in the same way at the
> same time. This is also good because it simplifies the design.
> 
> There are several questions to this, though:
> 1. what could the performance be, at best, in samples per sec?
> 2. when are EC's used with input signals that are audio-rate? and can
> this stuff be re-designed so that it doesn't require an EC at all?
> We're talking about a closed-box synth, not something that is fully
> modular and requires the signals to be patchable out in some sort of
> standard format.
> 
> Cheers
> D.
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