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.
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