Easy ways to Turn a Calculator and Radio into a Metal Detector

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About a month ago my brother said that he could make a metal detector at home from just two easily-available things - A radio and a calculator without even opening them. I didn't agree with him, then. But he was right. We can  make a metal detector from a calculator and radio.

Things we need
 


  • A pocket calculator which produces a beep sound.
  • An AM radio
  • Some tape (to put them together)
  • A working brain

    Now follow these steps ;
  • Turn the radio on and adjust the volume to the highest level so that you can hear everything clearly. Tune the radio on the high end of its AM band but not on any broadcast station.
  • Turn the calculator on
  • Now with both the radio and the calculator turned on, move the calculator around the radio until you hear a loud sound.
  • Keep them at the position where you hear a loud sound and stitch together with the help of tape. Maintain its position and make sure that they don't move apart.

    Now our metal detector is ready to buzz around metals

    Trying it out
    Bring the metal detector (the combination we got in the last step) near any type of metal. The calculator will start beeping. It will start beeping faster when it's brought nearer to the metal.

    Why it works the way it does?
    The loud tone coming from the radio is the calculator's electronic circuit producing a radio frequency signal. That being said, the radio waves from the calculator reflect off the spoon and are heard on the AM radio.

    So, now you have a metal detector that's made at home. Enjoy it and have fun.
    Reply below if you've any doubt or if something is wrong in my tutorial.
  • Thanks Asad






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