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SIMPLE ELECTRIC BELL

Posted by rajascientist Tuesday, September 1, 2009

You might have all came across many electric bells using electromagnet ,this is yet another one with slight modification , a home made electric bell.



Materials Required:

  1. Gong ( toy car )
  2. Hammer (battery cover sheet)
  3. Electromagnet ( Picture tube coil)
  4. 9 V battery
  5. Simple Switch Mechanism.(hanging wire)
  6. Pole Supporting Hammer ( pen refill)

Electromagnet:

When electric current passes through a coil wound on a soft iron core ,iron acts as a temporary magnet. It acts as a magnet until current passes through it. I got this electromagnet from junk TV picture tube, works perfectly.


More the number of turns ,more the applied voltage the strength of electromagnet will increase.

Gong :

Look for it in some toy cars ,or else take some tensile metal .


Hammer:

Do it yourself. I made one out of a battery cover metal sheet.

Simple Switch Mechanism:

It is the switch mechanism which varies from bell to bell. It depends upon creativity of creator. Many types mechanism are available. I have used hanging type switch. Nothing but a simple strip of wire hanging down touching the hammer.


Whenever the hammer is pulled and released , the circuit opens and closes.

Pole:

A small pole is erected near the electromagnet , bearing spring and holding hammer. I used a pen refill as a pole and a spring around the refill. Which gives the necessary tension to the hammer.




This is how it works . The speed of the hammer can be increased by increasing the power of electromagnet .

3 comments

  1. how much rolls the core??

     
  2. Normally 200 to 300 turns ll do...It depends on the strength of magnet you require and the voltage you use.

     
  3. Unknown Says:
  4. wats d hammer..

     

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