[sdiy] LM13700 as VC resistor

Jacob Watters jacobwatters at gmail.com
Sun Feb 9 19:06:34 CET 2020


Dan A. Made a filter with the H11F1 in 2012 after hearing about the chip in
this email list.

https://youtu.be/Zpf4WLRaU0M

He is usually fairly responsive in his comments. You could ask there (or
maybe he is still in this email list too).

On Sat., Feb. 8, 2020, 8:39 p.m. , <eidorian at aladan.net> wrote:

> The prodigious and awesome Gieskes uses H11F1 in the 3trins, for voltage
> control over a video-frequency schmidt-trigger based oscillator.
>
> https://gieskes.nl/instruments/?file=3TrinsRGB1
>
> https://gieskes.nl/
>
> Cheers,
> A.
>
> ---
>
>
> On 09-02-2020 12:21, Didier Leplae via Synth-diy wrote:
> > I searched a bit in the archives, but didn’t find anything.
> > The H11F1 sounds interesting. I will look into that.
> >
> >
> >> On Feb 8, 2020, at 12:05 PM, music.maker at gte.net wrote:
> >>
> >> 
> >>
> >> This has been bugging me because I seem to remember a thread here
> >> years ago.  I can't
> >> remember what the outcome was, but maybe a search of the archives (for
> >> which I seem to have
> >> no foo) might find it.  I do remember it was regarding the datasheet
> >> circuits mentioned by
> >> the OP.  Generally, the feel I think was that under the right circuit
> >> circumstances, it can
> >> work like a VCresistor.  I remember that the vactrol was compared and
> >> is known to work
> >> properly as a floating VCresistor albeit slow to change value.  Not an
> >> EE here, but looking
> >> at the floating resistor circuit I see two current producing
> >> electrodes posing as a
> >> floating resistor.  I think generally the statement about it's lack of
> >> use in synth
> >> circuits is due to it not being very good is probably correct.
> >> Looking at the single ended
> >> circuits, they are AC coupled...
> >>
> >> Has anyone experience with H11F1 devices?  Those should be a lot
> >> faster than vactrols,
> >> probably more consistent, but I don't know if the transfer function is
> >> useful in
> >> audio/synth circuits.
> >>
> >> -- ScottG
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