Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1982-09-30
1984-12-11
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324133, 324436, 340636, G01R 19165, G01R 3136, G01V 311
Patent
active
044881150
ABSTRACT:
A metal detector is disclosed which has a transmit coil, a receive coil, and circuit means for detecting metal objects due to a change in the magnetic coupling between the coils. Circuit board arrangement techniques are disclosed which enable the close placement of the transmit and receive coils and the circuit board, thereby allowing packaging of the metal detector in a small package. A low battery voltage indicator circuit is provided to warble an audio indicator signal to indicate sufficient battery voltage. In the event the battery voltage drops below a certain level, the warbling of the indicator signal ceases and a steady tone is generated thereby indicating a low battery voltage condition.
REFERENCES:
patent: 2820959 (1958-01-01), Bell
patent: 3196357 (1965-07-01), Hoag
patent: 3882481 (1975-05-01), Turner
patent: 3896371 (1975-07-01), Hametta
patent: 3909722 (1975-09-01), Bennett
patent: 3919642 (1975-11-01), Allen
patent: 4024468 (1977-05-01), Hirschi
patent: 4249128 (1981-02-01), Karbowski
patent: 4334191 (1982-06-01), Podhrasky
patent: 4376265 (1983-03-01), Kiuchi et al.
Garrett Electronics
Strecker Gerard R.
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