[sdiy] Quick query about 2164 VCAs

Neil Johnson neil.johnson71 at gmail.com
Mon Mar 18 00:06:12 CET 2019

To be more precise, paralleled ins, outs and CVs - as shown in the
datasheet - works.


On Sun, 17 Mar 2019 at 22:58, Neil Johnson <neil.johnson71 at gmail.com> wrote:
> Hi Tom,
> > What makes you think that:
> >
> > A) this parallel-inputs-independent-outputs arrangement only works if the CVs are identical?
> Looking at the schematic shown in the SSI2164 datasheet and
> considering the various current paths within it I have a strong
> suspicion that unless the currents in the VCA bit are balanced between
> the gain cells then any imbalances due to different control voltages
> will cause the inputs stages to behave differently, and so the input
> current will not be shared equally between the gain cells.
> > B) the outputs have to be paralleled too?
> That's a less certain hunch, and I may be wrong, or right ;)  The only
> real way to test this would be to build it and try it out.
> What I do know is that paralleled ins and outs does work, as I have
> that working on the bench.
> Neil
> --
> http://www.njohnson.co.uk


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