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Last Updated on: Thursday, April 07, 2016 01:02 PM

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Miscellaneous Circuits

  • Visible Light Blocking Filter
    This isnít an electronic circuit but the drawing below shows the curve for an optical filter made from exposed color film. The material blocks most visible light but is very transparent to 880nM infrared light. Kodak 100ASA is exposed to "cool white" fluorescent light for about 5 seconds.

  • Worm Harvester
    When I was a kid my engineer uncle built a circuit similar to the one below. My cousin and I used it to force earth worms out of the ground to be used for fishing. It worked like a champ. Please be careful since there is high voltage at the probe tips.

More  Miscellaneous Circuits
 

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