[sdiy] LM13700 as VC resistor

Quincas Moreira quincas at gmail.com
Sat Feb 8 18:04:11 CET 2020


Here's the simplest VC resistor you can make, much easier than using an OTA!
https://youtu.be/8BOnvSQpoGY

On Sat, Feb 8, 2020 at 9:47 AM Youssef Menebhi <youssef.menebhi.79 at gmail.com>
wrote:

> I breadboarded the application notes schematics at some point and had
> no luck with it, either. I'd be curious to know more about this.
>
>
>
> On Sat, Feb 8, 2020 at 5:02 AM Didier Leplae via Synth-diy
> <synth-diy at synth-diy.org> wrote:
> >
> > I am curious to know anyone’s opinions on using the LM13700 as a voltage
> controlled resistor.
> >
> > The LM13700 datasheet has a couple schematics which I have tried
> building, with mixed results. I’m having a hard time knowing what sort of
> resistance I am getting as the multimeter gives strange and inconsistent
> readings.
> >
> > The information on the datasheet is somewhat incomplete in my opinion
> and it is not easy to find much info online either.
> >
> > It doesn’t seem like it is common practice to use these as VC resistors.
> Is that because it doesn’t work very well? Or use too many parts?
> >
> > Any insight on this would be appreciated.
> > I’m interested mostly in the single ended schematic at the moment.
> >
> > Thank you,
> >
> > Didier
> >
> >
> >
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Quincas Moreira
Director | QMA
mobile:  5534988825
site:  quincasmoreira.com
email:  quincas at gmail.com
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