FIELD: hardware for correcting automatic control systems. SUBSTANCE: differentiating device has two series-connected inverting operational amplifiers 9, 10 and also third inverting operational amplifier 11 whose negative feedback is applied through capacitor. Input of operational amplifier 11 is connected through resistor 6 to output of operational amplifier 6 and output, to input of operational; amplifier 9 through resistor 7. Output of operational amplifier 10 is connected through resistor 5 to input of operational amplifier 9 thereby forming positive feedback which reduces amplitude drift. EFFECT: reduced amplitude drift. 1 cl, 2 dwg
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