30cmx30cm metal at 3mtrs? in electronics, nothing is impossible it will only take time to build and search and the main tools is the brain...
in pi, if you want to build powerful pi, then modify the transmitter,make it more powerful to penetrate the ground. ex. flyback of 3kv with 24 volts 7amps battery (2 mc batt 12v each) but you must suppress the flyback voltage going to rx circuit or it will damage the whole circuit.
the bifillar coil (gd1950 idea)
the dual mosfet output going to bifillar coil(my idea)
and the tuned frequency for big targets.
or the multi frequency transmitter(gd1950)
this idea were all tested and used by very expensive pi md. just keep on searching and study the schematics you gathered and you can design your own powerful metal detector. do not just asking schematic and pcb then build and if the result is not good and then you will be discourage. use your brain. we all know there are so many wizzards on this forum you can ask some help.
regards, ram
regards, ram,
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