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"you would likely be better off to use a linear array of complete individual small detectors to accomplish what you want." Thanks for the advice there that is where ill go next. There definitely is a lot to be gleaned and time saved by browsing through patents. I think i will try and multiplex 2...

Do you think this may work? The coil design i mean.

Thanks for your reply VE1BLL, I think it would be easier to used a group of smaller coils cycled/phaseed to avoid interference, any ideas on a circuit that can sample multiple antennas at high speed? (the coil frequencies are generally 5khz-75khz) Thanks Again

Hello, I am designing a metal detector coil for a project: it is long/narrow, perhaps up to 2 meters in length. Here is the problem - How can the detection depth be kept uniform across the whole length, and detect at no more than 30-40 cm deep. Is the best approach to use lots of smaller DD...