VERFAHREN ZUM SUCHEN UND ORTEN INHOMOGENITAETEN UND SCHALTUNGSANORDNUNG ZUM DURCHFUEHREN DIESES VERFAHRENS.

摘要

A metal detector circuit has a sensor stage comprising a sensor coil (1), an oscillator (2) and a rectifier (3), coupled via an amplification stage to an acoustic and/or optical display (9). The amplification stage has a dynamic amplification channel (1) and a static amplification channel (2) coupled in parallel between the rectifier (3) and the display (9). The static amplification channel (2) is automatically switched in and the dynamic amplification channel (1) switched out upon the dynamic range of the latter being exceeded.