This is simular to some other Pin Pointing detectors.
However. The Meter and other small circuit differences, gives better performance.
On the Schematic, I show Two Possible Coils.
1) The Ferrite Rod, creates an Accurate Pin Point.
But it also has a Very Narrow Detection Field.
2) The Dual Wound "Tesla Coil" Creates a Wide Field of Detection.
With Maximum Sensitivity at the Center of the coil.
Detection of metal is with a Meter and LED.
The Meter Gives a Much Better Sensitivity.
On My Prototype, I can detect a 1/8 Gram Gold Nugget at One Inch,
With Either the Tesla Coil or the Larger Ferrite rod coil.
But Only about 1/2 inch with the Tiny Ferrite rod one.
Changes to capacitor "CX" will change the Operating Frequency.
It may also Improve Sensitivity.Linkback:
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