FIELD: equipment forming alarm signals in passive intrusion detection systems, automatic systems, special and home appliances. SUBSTANCE: reception of electromagnetic field of extremely low frequencies excited by intrusion object into protected space is conducted, voltage is isolated and alarm signal is formed by change of voltage that is caused by disturbance of field by unauthorized intrusion of object having electric charges. Gear for realization of method has element sensitive to electromagnetic field in the form of operational amplifier embraced by deep negative coupling with open inverting and grounded noninverting inputs. Input resistance of inverting input of operational amplifier exceeds 1012 Ohm. Low-pass and high-pass filters are connected in series to output of operational amplifier. Output of high-pass filter is connected to input of comparator connected with output to amplifier that is connected to output stage to form alarm signal. EFFECT: improved reliability of method and gear. 2 cl, 2 dwg
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