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Sounds like you want somebody to do your homework for you.
WHAT book?
1. There should be a cap in parallel with that zener
2. There's no sense in putting that 220k in series with that 1k
3. That dual-comparator thing is pointless
4. The LM324 is garbage and won't work at those frequencies
5. That circuit is awful, don't use it, try one of these instead -
Sensors / Detectors: Metal Detectors electronic circuits
There's much that can be said for that simple circuit, however for us to explain it as an easily understandable lesson requires you to know some basic electronics as well. So you are already at a disadvantage. Try a far simpler circuit instead.. like a battery, switch and l.e.d. Observe correct polarity.... there's a good start!I'm new to electronics and found this circuit in a book.
I would like to know its working.
Help me.