It is build with 555, coil and few other components. Lots of color photos. To begin, we are going to build a coil that operates with the VLF metal detector type. In general, larger searchcoils will give better depth with larger targets and better ground coverage. A searchcoil's detection pattern is When you hit ...
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=http://www.frostserv.com/fd4374/blhkriw.php%3Fvas%3Dhow-to-make-a-metal-detector-coil&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNHOsFtXp_01cxOBBUWfVOqpfNtsSQ
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