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Ultraviolet Switch? Answered

I am trying to figure out a way to make a switch that is activated by a UV light. I have looked all over the web and cannot find a thing on this subject. The reason that I am trying to do this is that I recently purchased a Sonic Screwdriver that  has a IV light in the end and I was wanting to make it turn on/off things with the push of a button.

1 Replies

iceng (author)2011-12-25

Use an LDR behind a blue filter and a phosphorescent screen.


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