P3D Re: Halogen viewer bulbs

[George Gioumousis <georggms@xxxxxxxxxx>]

Dr. George A. Themelis wrote
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> 
> When using high current/low voltage bulbs in viewers, you have to worry
> about light flickering, which is caused by oxidation in the switch
> contacts.  I am now looking into installing a "microswitch" like Dave
> Burder has done in the modified Sterolists.  It is not clear to me how
> these switches work.  Is there a contact made?  If it is, why would
> these switches eliminate flickering? (as some people claim - I have no
> personal experience)
> 
> -- George Themelis
> 
I took a couple apart while in college. They have a bistable spring so
they make or break cleanly. The spring (then, I don't know for now) is
made of a beryllium-copper alloy which does not fatigue anywhere as
much as most metals. They seem to last forever.

Sincerely,
George Gioumousis


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