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Stud Finder Circuit Diagram

I am looking for a circuit diagram for an electronic stud finder (the type of finder that measures the density of the wall rather than a metal detector).  Can anyone point me in the right direction?

Christopher

techxpert5 years ago
you can add this metal detector i found on google images i claims to detect studs :) with the teroid coil
Toroidal_Coil_Inductor.jpeg60-d4e9a7e1b5.jpeg
techxpert5 years ago
i found this on google images it's a metal detector but it can be used as a stud finder with the right coil :) coil should be like a big inductor/ teroid
Toroidal_Coil_Inductor.jpeg60-d4e9a7e1b5.jpeg