Looking for a inductance sensitive Oscillator

Hi All...
I'm looking for an Inductance Sensitive Oscillator circuit ...
i want to make a "Metal Detector" circuit and need details,can anybody help me ?
Thanks in advanced

Any of the classic LC ones will work. The usual frequency chosen is around 100 kHz. You then mix that with another oscillator which uses a small coil and you hear a tone. When the metal comes within the magnetic field of the coil of the first oscillator, the inductance and thus the frequency change. You hear a change in the mixing frequency.

as i mentioned ,i need more details.
i need this circuit for a vehicle detector sensor,if you experinced on this subject please help me.
i haven't enough frequency change so i cann't detect vehilces.
it's an inductive loop vehicle detector.
thanks for your attention.

sum info about Metal Locators.
Basic Types and Design Factors

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