[sdiy] using LM13700 in differential mode to reduce trimmers

[Eric Schlappi]

@aaron That's the paper I was talking about, thanks for linking it into the
discussion!

@Ian Looking at the wrong things I guess! I only remember seeing it
(well... the 3080) used with differential input as the VCA in the
radioshack mg-1, and that's presumably because the filter output is
differential.

Thanks again, I guess I'll keep on using balanced inputs for OTAs but won't
get rid of the trimmers.

On Tue, Oct 27, 2020 at 2:01 PM Ian Fritz <ijfritz at comcast.net> wrote:

>
> > On Oct 27, 2020, at 2:18 PM, Eric Schlappi <eric.schlappi at gmail.com>
> wrote:
> >
> > 
> > You guys are right.
>
> Why, thank you! Please bear in mind that a number of us guys have worked
> with these chips since they first came out in 1979.
>
> > I guess I was wondering why I don't see the lm13700 used with
> differential input more often, or am I still missing something?
>
> I’ve always used balanced inputs for mine in everything I have ever built,
> except when they are used as switches.
>
> Dunno what you have been looking at; this is pretty standard as far as I
> know.
>
> Ian
> >
>
>
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