P3D Re: Viewer Circuitry (LEDs)

[Tom Hubin <thubin@xxxxxxxxx>]

Boris Starosta wrote:
> 
> >From: Tom Hubin <thubin@xxxxxxxxx>
> ...
> >LEDs convert most of the electrical power to visible light. And that
> >light is well directed so most of it can be used to illuminate the
> >slide. Very little waste so your battery will last much longer. 50 to
> >500 times as long as filament type sources.
> 
> I'm just popping in to P3D infrequently these days, but this caught my eye.
> I would appreciate an email from whoever started this thread or whoever is
> actually building the circuit, once the thing is working.  (Or post to P3D)
> Actually a circuit diagram posted to the web would be ideal.  I am
> electrically non-gifted, but would love to build an illuminator for my
> Berezin "super-sharp" viewers.  The different light boxes I have tried
> (fluorescent) are battery hogs and not very bright and too big to be
> convenient.
> 
> Thanks, Boris

Hello Boris,

I think I started this by suggesting how to more efficiently use a light
source with condenser optics, even in a viewer. I claim that it is so
much more efficient that you could even use one 3.6v, 20ma, white LED
per slide. That is 72mw per slide or 144mw total electrical power. I
will find a couple of my postings and send them directly to you. Maybe
not in the original order.

Tom Hubin
thubin@xxxxxxxxx