Re: Full frame (35mm) viewer (lighting)

[erker@xxxxxxxxxxxxxx (Greg Erker)]

>My medium format stereo viewer uses two halogens hooked up in parallel,
>I guess, with two D nicad cells. With just two cells it would be
>parallel, right? Anyway, the bulbs drain the nicads fairly quickly. I
>believe my bulbs are rated 0.8A thopugh I bought them from George too.
>Eventually I switched to the highest capacity D nicads. Also, nicads are
>necessary to get adequate current flow. Alkalines resulted in lower
>light output.

  In my MF viewer I ended up putting the two
0.8A@xxxx halogens in series. In parallel I
was getting too much voltage drop on my cable
(external battery pack), setdown switch and
the voltage out of the nicads was lower.

  Putting them in series made things much
better. I power them from 4 C-cell nicads
which combined with me setdown switch lasts
much longer than I ever use it.

Greg