Vactrols (was: New Stuff)

[Martin Czech]

:::I suspect it is not just a combination of a LED and a LDR (CdS?), but
:::a some kind of special photocells. I remember there were some points

And I believe up to now that's exactly what they are ;->

The specific properties of the CdS-crystal should influence carrier life
time and thus resistance rise time.  Generating carriers with light "out
of nothing" is no problem, given that the light has enough energy, but
eating up the carriers get's more and more difficult when the resistance
rises, because the R*I drop makes it difficult to suck all carriers away,
they feel not much of the external field.

Perhaps these vactrols have optimised crystals with high recombination
rate, thus better rise/fall ratios.

???

I don't know.

m.c.