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

[Stephen Makdisi]

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.

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. 

-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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