VERY EASY HOMEMADE ELECTRIC DOORBELL. TECHNOLOGY
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With some materials and some desire, you can make this electric bell is a work of "manual work" or a "science fair".
It is based on electromagnetism, where an electromagnet attracts a rod that will sound a bell, a simple but ingenious design causes the electromagnet to stop working and the rod that recedes sounds another bell, repeating the cycle. The result is a rattle that sounds like a classic bell.
Few materials are needed, easy to obtain and economical: a wood, two bells, a rubber band, three tines, a bit of galvanized wire, enameled wire to wind, a screw, a washer, a nut, a clothespin ...
In this work it is NOT necessary to use tools such as drills, soldering iron, etc., we are using only a pliers and a small screwdriver
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4 ноя 2017
