[sdiy] LM13700 as VC resistor

Didier Leplae didierleplae at yahoo.com
Sun Feb 9 02:21:37 CET 2020


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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