[sdiy] the obscure output of a 2164

[Mattias Rickardsson]

Of course, it would be madness to tie inputs together. :-)

/mr


Den 9 mars 2017 3:54 em skrev "Neil Johnson" <neil.johnson71 at gmail.com>:

> Mattias Rickardsson rote:
> > On 9 March 2017 at 07:53, David G Dixon <dixon at mail.ubc.ca> wrote in
> > his nice beefy 2164 description:
> >> However, be careful about using 2164s in parallel, as they will not
> retain
> >> independent control (I learned this the hard way as well).
> >
> > Interesting, what kind of problems have you encountered here? :-)
> >
> > I've used parallel 2164s for years and never noticed anything strange.
>
> You can parallel up the outputs as they just pump whatever current
> they want into the virtual earth node.
>
> You CANNOT directly parallel the inputs though - the internal feedback
> paths within the 2164 end up fighting each other and then bad stuff
> happens (latchup, oscillations, etc).  You need some isolation between
> the inputs if you want to run multiple 2164 gain cells in parallel.
>
> Neil
> --
> http://www.njohnson.co.uk
>
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