Things we need
Now follow these steps ;
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.