Electromagnetic buzzer
There are many fun and useful applications of magnets. Here we look at how to create a simple electromagnetic buzzer. Make your own using basic items you can find around the home.
You will need:
- wirestrippers
- scissors
- coated wire (one 2m piece, 2 10cm pieces)
- screwdriver, paper clips
- D battery
- tape
- card
- steel bolt
- nail file
- steel can
- cotton reel
- paper fasteners
- plasticine
- rubber band
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1
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Make a switch by pushing two paper fasteners through the card, no more than a paperclip length apart. Attach a steel paperclip to one of the fasteners. |
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2
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Strip 2cm at both ends of the wire, and wrap firmly around the bolt about 200 times with about 10cm of spare at each end. |
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3
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Fix horizontally to the card with plasticine.. |
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4
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Using the rubber band attach the nail file to the cotton reel. |
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5
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Scrape the paint off two patches on opposite sides at the bottom of the can. |
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6
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Tape one end of the wire to the metal part of the nail file. |
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7
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Fix the flat end of the cotton reel to the card using plasticine. |
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8
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Strip 1cm at both ends of the 10cm pieces of wire. Connect one piece from a battery terminal to the switch, and one from the other battery terminal to a scraped patch on the can. |
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9
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Stick the can to the card, make sure that the nail file touches the other scraped section. |
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10
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Make the final connection using the spare end of wire from the bolt to the switch. |
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11
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Close the switch by bringing the paperclip into contact with the second paper fastener. |
