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How to Make a Crank Flashlight Circuit

In this article we are going to construct a crank flashligh circuit which requires no battery. It’s not free energy, but it converts oscillatory motion to electricity, which can power the flashlight for a couple of minutes. This flashlight will be useful in emergency situations where no access to electricity or batteries.

Saturday

Tuesday

Electronic Door Circuit for Pets

The post explains a simple electronic door circuit for pets which can be used as an electronic dog door for allowing only your specific pet dog to use the entrance, while keeping it locked for "strangers". The idea was requested by Mr. Dave Monette.