give it metal detectors with a penetrathion depth of 1m

[Carl-NC]

Why is it impractical? I have one, it works.

As I said, most metal detectors will go 1m deep if the coil is large enough and the target is large enough. Find a detector that has an available coil 50cm or larger, then see what it can detect at 1m.

[Levin]

A coin with a diameter of 1m would be very impractical, what are the other possibilities?
Levin

[Carl-NC]

A coil with a diameter of 1m.

[Levin]

do you with am 1m coil mean a coil that have a diameter of 1m or a coil that is built for a penetration depth of 1m ?

[Carl-NC]

Almost any metal detector can go 1m deep if you put a big enough coil on it, and the target is large enough. The easiest solution is to pick a PI design and build it with a 1m coil.

[Levin]

Hello
I'm new to metal detector construction but have basic electronic skills. Can you also build metal detectors that have a penetration depth of 1 m, if so where can I find instructions for one?
thanks for answers
Levin