[sdiy] Unique sounding modules that can't have voltage control?

[cheater cheater]

On Fri, Feb 9, 2024 at 11:04 PM Stephen Makdisi <shmakdisi at xvetrd.us> wrote:

>
> I got a feeling a Baxandall is going to be a real pain to get under
> control with a 2164, but probably easier than tuning a Twin T or a Wein
> bridge network.
>

Can you suggest some modules that use those topologies? Am I right to think
that the 808 BD is a Twin T? What module uses a Wien bridge?


I think pretty much any circuit that requires both sides of the
> potentiometer, or even worse, both sides of a dual gang pot, is going to be
> difficult.
>
> But not impossible. Not something I plan on trying, but not impossible.
>

Thanks a lot! Where do you think the difficulty comes from?


> -Stephen
>
> On Feb 9, 2024, at 14:20, David G Dixon via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
> 
> Not sure about Baxandall, but recently I figured out how to put the Korg
> morphing LFO circuit under voltage control using 2164.  I figure that if
> that is possible, then the Baxandall circuit should be a piece of cake.
> The big problem with 2164 is that it has to terminate at a virtual ground,
> so that means that some inverting opamps always have to be shoehorned in
> there, even if they are not really needed or wanted.
>
> I'll work up the Baxandall circuit this weekend and report back with my
> findings, and maybe a demo, next week.
>
> ------------------------------
> *From:* Mike Bryant [mailto:mbryant at futurehorizons.com]
> *Sent:* Friday, February 09, 2024 2:18 AM
> *To:* Adam (synthDIY); David G Dixon
> *Cc:* synth-diy
> *Subject:* Re: [sdiy] Unique sounding modules that can't have voltage
> control?
>
> [*CAUTION:* Non-UBC Email]
>
>
> > On 9 Feb 2024, at 2:27 pm, David G Dixon via Synth-diy <
> synth-diy at synth-diy.org> wrote:
> >
> > I doubt that there are many things that couldn't be put under voltage
> > control with a 2164 and a bit of ingenuity.
>
> Baxandall tone control ?    I imagine it would make the op-amp unstable
> without a lot of extra caps.
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