FIELD: electronic engineering. SUBSTANCE: power transistor switch has power translator, auxiliary power supply with center tap, optocoupler transistor, resistor, output stage of intermediate amplifier whose power terminals are connected to plus and minus terminals of power supply and output is connected to transistor base; collector of optocoupler transistor is connected to resistor whose second lead is connected to positive pole of power supply; power transistor emitter is connected to center tap of auxiliary power supply; anode of first diode is connected to base of optocoupler transistor and its cathode, to transistor collector and to input of input stage; resistor is connected through its first lead to negative lead of power supply and through second lead, to optocoupler transistor base; second diode is connected through its anode to emitter of optocoupler transistor and through cathode, to negative pole of power supply. EFFECT: improved design. 2 cl, 3 dwg
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