FIELD: protective signalling systems. SUBSTANCE: gear is meant to prevent unauthorized access through windows and doors of buildings or vehicles. It has piezoceramic element included into composition of vibrator of sensitive element. It forms electric signal when vibration acts on gear. Alarm signal is not formed if value of vibration is constant or change smoothly as signal processing circuit includes capacitor which does not generate signal when voltage across it changes slowly. When vibration changes suddenly, voltage across capacitor alters by jump and alarm signal is formed. EFFECT: enhanced sensitivity and functional reliability. 5 dwg
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