FIELD: electricity.
SUBSTANCE: device comprises an input unit 2, two terminal electrodes A and B which are connected to the input block, a phase inverter 3 connected to the contact electrode A, one amplifier 41 integrated in each terminal, and detectors 5A and 5B of input amplitude modulation caused by capacitance variation in each of the terminal electrodes A and B.
EFFECT: reduced number of the circuit elements and higher operational reliability.
10 cl, 4 dwg
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