[sdiy] Vactrol model

[JH.]

Yes, it's just built arounf a lookup table, i.e. piecewise linear
approximation.
Easy, but time constants are not modeled.
I think I also just used 3 diodes in a row to model the LED electrically.
The important thing is to model LDR resistance vs. LED current, though.

Find the models attached to this mail. Probably works with PSpice only.

Also contains a similarly crude model of the VTL5C3 (aka Buchla vactrol,
if I'm not mistaken).

JH.



> Very interesting project!
> I'm interested in your (static) vactrol spice model.
> Did you make a look up table for the values?
> I did some simulations with vactrols by using
> a normal 1n4148 led "knowing" what current corresponds
> to which Resistance.
> But that doesn't seem to match the curcuit I was working on,
> probably because of the wrong Diode model...
> (I didn't find a model for led's so I simply used the 4148)
> But I still didn't get around to doing my own dedicated vactrol model.
>
> If you send me yours, I'd give you all schematics I come up with using
this
> model, if you want.
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