555 metal detector problem in making inductor L1

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Er Sanjit

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hi,
I am making a metal detector for my robot. I decided to make single metal detector, that's why I chose it making with 555 as I don't have time for complex circuits. Now, the problem I am having is that I don't know how to make a inductor suitable for the circuit.




I have used 1microF capacitors instead of 2.2microF.
So, what i had to do to make suitable inductor.


THE MAIN PROBLEM IS THAT I DONT KNOW HOW THIS CIRCUIT WORKS AND I DONT EVEN KNOW HOW TO MAKE INDUCTOR SUITABLE



PLEASE HELP ASAP

THANKS
 

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