There is plenty of great links on here on building a detector. Try to understand how a detector works first.
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http://www.gi.alaska.edu/~jesse/treasure/misc/howdetector.html
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http://www.ehow.com/how-does_4567106_metal-detectors-work.html
Some sites like Minelab have great tutorials.
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http://www.minelab.com/usa/consumer/knowledge-base/minelab-technologies
Other sites are geared just toward what your asking. Believe this site also sells some deep ground penetrating radar machines.
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http://www.lrlman.com/agl.htm
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http://www.treasurequestxlt.com/community/index.php
Do you want to do this as a hobby. Or are you wanting something that hasn't been invented yet? I encourage you to read about how the detectors work first, and see why there is no gold detectors, just people who know thier machines.
If your looking for a better or second machine, I suggest save your clad and buy it, as its already been made. About everything you can do with a detector has been done. I like the tesero and minelab machines in the $800.00 dollar range. But only for detecting gold nuggets. I dont buy into what everyone else uses, I but the machine for the job.
If the machine has a interchangable coils and gets good reviews, I would do that. Some manufactures make claims about size or discrimination. I balance my $100.00 dollar machine out by using no discrimination and digging everything. I can get away with that in my area.
There is some great plans, and sellers of circut boards in the above links.
Since you appear to have posted the same question before, really suggest you do some reading. Dont mean to discourage you, but you will get a better product by buying not building. I have only seen a few who could actually build a detector on here. Its a task not to be taken lightly.
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http://www.thunting.com/smf/index.php/topic,20254.msg133365.html#msg133365
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The more I learn, the less I know.
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