Circuit -Miscellaneous Circuits / Schematics List - Circuits designed by David A. Johnson, P.E.

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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, March 22, 2012 07:41 AM

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Miscellaneous Circuits

Electrical Device Harvests Earthworms
A 120vac or 240vac isolation transformer is used to force earthworms from the ground. (added 7/06)

Visible Light Blocking Filter
This isn’t 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.

Wave Power Generator Demo System
An inexpensive stepper motor is used as a voltage generator in this wave generator demo. (added 7/06)

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.

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