homebrew vactrols

[Paul Perry]

At 10:12 AM 19/04/00 +0200, /Jorgen wrote:

>In my experiments, a narrow beam LED worked best, so maybe this doesn't
matter much. My LED had the lens just a millimeter or so from the cell
surface, so it can't have been very evenly illuminated.
>
I expect that the segments you can see are all in parallel,
so it might well be better to heavily illuminate one small area.
paul perry melbourne australia