Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1980-11-12
1983-12-27
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324133, 324239, G01V 311, G01V 3165
Patent
active
044233779
ABSTRACT:
A metal detector is disclosed which has a transmit coil, a receive coil, and circuit means for detecting metal object 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: 2129058 (1938-09-01), Hedden
patent: 3626279 (1971-12-01), Walden
patent: 3769575 (1973-10-01), Rist et al.
Simonton, Jr.; John S., "Carpenter's Mate" Popular Electronics, Sep. 1969, pp. 69-72.
Whitehead C. C., "Metal Pipe or Wiring Locator" Practical Electronics, vol. 12, No. 12, pp. 952-955, Dec.1976.
Sargent-Sowell Catalog No. 150 (1979), p. 354.
Garrett Electronics
Strecker Gerard R.
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