[sdiy] LM13700 as VC resistor

[Spiros Makris]

Well, if you think about it, the circuits that need a resistor to be
changed to a VCR usually don't require any serious degree of precision. For
example, a friend was looking for a way to make the tune control of a
classic kick voltage controlled. It wouldn't matter all that much if the
control characteristic was a bit weird, as long as it works for the whole
range without derping out on you.

Spiros

On Mon, Feb 10, 2020 at 4:37 AM <rsdio at audiobanshee.com> wrote:

> In addition, a VC resistor might be close to linear to start with, but if
> you try to lower the resistance using parallel resistors then it will
> definitely be quite nonlinear in response.
>
> Of course, if you’re really lucky then you might want that nonlinearity.
> There aren’t too many situations where it works out perfectly, though.
>
> Brian
>
>
> On Feb 8, 2020, at 10:08 AM, Quincas Moreira <quincas at gmail.com> wrote:
> > You can tune the LED brightness and use parallel resistors to get lower
> resistances as needed, but yes, LDRs are a bit slow to respond, so if you
> need high speed they are not ideal.
> >
> > On 8 Feb 2020, at 11:46, Didier Leplae via Synth-diy <
> synth-diy at synth-diy.org> wrote:
> >> In my experience vactrols seem a bit hard to control and the
> resistances are very high.
> >>
> >> On Feb 8, 2020, at 11:39 AM, Michael Zacherl <sdiy-mz01 at blauwurf.info>
> wrote:
> >>> On 08.02.2020, at 18:04, Quincas Moreira <quincas at gmail.com> wrote:
> >>>> Here's the simplest VC resistor you can make, much easier than using
> an OTA!
> >>>> https://youtu.be/8BOnvSQpoGY
> >>>
> >>> at the cost of speed, alas.
> >>> m.
> >
>
>
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