FIELD: electricity.
SUBSTANCE: in tunable metre of non-linear distortions with differential amplifier and with double T-shaped bridge connected to its output and consisting at the input of parallel connected differentiating and integrating branches; at that, differential amplifier is covered from the output to inverting input by means of feedback inertially controlling the amplitude of generated sinewave oscillations, and from the output to non-inverting input through double T-shaped bridge by means of positive feedback which specifies the frequency of generated oscillations by means of values of RC-elements of double T-shaped bridge, the outputs of differentiating and integrating branches are connected respectively to non-inverting inputs of the first and the second operational amplifiers, which are covered with negative feedbacks. The third introduced potentiometre the input of which is connected to output of differential amplifier through introduced fourth potentiometre to movable contact of which metre of effective values is connected, is connected to outputs of the first and the second operational amplifiers.
EFFECT: eliminating the dependence of phase shift value on frequency in amplifier-phase shifter.
