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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Wednesday, June 02, 2021 04:01 AM
Hobby Circuits List
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LINK to Dave's circuit, but DO NOT COPY any files to your WEB
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Wave Length / Optical Fiber Indicator
designed
by Dave Johnson |
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Problem: Design a a simple battery powered device that would quickly spot check to see if a fiber cable was active with light and determine which one of the 4 wavelengths was being used. Solution: The concept was to have
four germanium photodiodes along the front of a suitable plastic box.
Each photodiode would have a narrow band optical filter placed in front so
it would respond only to light in that specific narrow wavelength. A
comparator circuit would monitor the light from each photodiode and light a
simple LED and sound a beeper if the light from an optical fiber matched the
selected band. The user would just have to pass the end of the fiber
over the four detectors to determine an active fiber and the wavelength of
light being used. The whole circuit could be powered by 3
volts from two AA cells. |
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DC Magazine, September 2009, Page 7:
Wave Length Indicator |
