[sdiy] amateur question about modifying the ms-20 ota filter

[Paul Perry]

In my commercial Frostwave version, I used fet followers. I can't
personally say whether this is the best thing to do, but my customers were
happy.
paul perry melbourne australia

On Mon, Dec 12, 2022 at 10:21 PM Roman Sowa <modular at go2.pl> wrote:

> Try replacing 10k in emitter followers with 1k
>
> Roman
>
> W dniu 2022-12-12 o 11:14, Emily Straight via Synth-diy pisze:
> > i'm tweaking the rene schmitz <https://www.schmitzbits.de/ms20.html>
> > implementation of the ms-20 filter for a project, and i was hoping to
> > use the emitter followers on the 13700 rather than separate op amps if
> > possible, it seems, like, vaguely wasteful not to or something. in
> > simulation this is resulting in killing the resonance on the negative
> > side of the waveform, however. is this because of a mistake i made
> > setting it up, or is the 13700 buffer fundamentally unsuited for the
> > purpose? i found one schematic
> > <https://aisynthesis.com/wp-content/uploads/2020/05/MS20v2.5.pdf> that
> > appears to do the same thing so i'm guessing the former, though idk
> > maybe theirs sucks too lol. i also put a vca in the feedback path rather
> > than a potentiometer, maybe that's causing problems? i have essentially
> > zero experience in analog electronics if you couldn't tell
> >
> > thanks <3
> > -emily
> >
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