Compact metal detector of the balanced induction type
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United States of America Patent
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-
Dec 27, 1983
Grant Date -
N/A
app pub date -
Nov 12, 1980
filing date -
Nov 12, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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