Selective metal detector circuit having dual tuned resonant circ

Details Selective metal detector circuit having dual tuned resonant circ Selective metal detector circuit having dual tuned resonant circ

1975-01-22

1976-06-01

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01V 308

Patent

active

039612384

ABSTRACT:
A metal detector circuit is described utilizing a search coil inductively coupled to a parallel resonant circuit. This circuit replaces the tapped parallel resonant circuit of a Hartley oscillator. Feedback to sustain oscillation is provided by a series resonant circuit driven by the parallel resonant circuit, with the series resonant circuit having a higher resonant frequency than the parallel resonant circuit.

REFERENCES:
patent: 2972116 (1961-02-01), Lowe
patent: 3013256 (1961-12-01), Damast
patent: 3015077 (1961-12-01), Elam et al.
patent: 3201774 (1965-08-01), Uemura
patent: 3284724 (1966-11-01), Marlow
patent: 3355658 (1967-11-01), Gardiner
patent: 3422415 (1969-01-01), Ichimori
patent: 3453532 (1969-07-01), Gardiner
patent: 3503007 (1970-03-01), Kutschbach
patent: 3742341 (1973-06-01), Clowes
patent: 3747012 (1973-07-01), Buck

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