FIELD: signalling facilities. SUBSTANCE: device has pulse generator connected to one electrode of contact sensor through RC filter. Second electrode of sensor is grounded. Pulse generator is also connected to normalized signal former the output of which is connected to selector made as amplifying cell with inverting and noninverting outputs between which capacitor is inserted. Buffer amplifier is connected to visual indicator, and audio indication signal former is connected to pulse generator output. Its output is connected to audio indicator. Device is provided with selected signal level inverter with low input resistance and output with signal logical levels. Inverter input is connected to noninverting output of selector amplifying cell, and its output is connected to buffer amplifier input and to other input of audio indication signal former. Inverter provides for stabilization of input characteristics of first stages. Inverter availability also allows adaptation of sensor signal relative to any of its constructions by selection of setting elements. EFFECT: improved operating characteristics. 4 cl, 4 dwg
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