FIELD: intrusion detection devices.
SUBSTANCE: capacitance-operated device comprises series connected: input selective node for activation signal generation, detector, amplifier, threshold device and actuator mechanism, wherein the input node comprises series connected: selective narrow-band-selective filter and reference radio frequency amplifier that provide for interference suppression and an optimum signal amplitude at the detector input connected with the output of the reference amplifier.
EFFECT: enhanced interference immunity, sensitivity and reliability of the device operation.
1 dwg, 2 dwg
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SU1150598A1 |
