FIELD: electrical engineering. SUBSTANCE: device has operation amplifier 1 with negative feedback 9 which output is used as device output, the first resistor 2 whose first outlet is connected to inverting input of operation amplifier 1, one or several piezoelectric resonator units 3 connected in parallel whose first outlets are connected to non-inverting input of operation amplifier 1, the second resistor unit 4 whose first outlet is connected to non-inverting input of operation amplifier 1. The second outlet of the first resistor unit 2 and the second outputs of piezoelectric resonator units 3 are connected to each other and to inlet potential lead. The second outlet of the second resistor unit 4 is connected to the common bus. Capacitor 5 is placed between the non-inverting input and output of operation amplifier 1. EFFECT: simplified design. 2 dwg
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