t3 acts upon the aforementioned power switching semiconductor device tl in the known manner pursuant to this a c voltages are generated to the two shown secondary windings of t1 in accordance with the converter principle known from so called blocking oscillator dc converters and which when rectified result in the regulated voltages u g and u gg at the tapping point between the voltage divider rg1 rg2 connected between the regulated voltage u g and chassis ground there is taken off the voltage u 39 g which is in proportion to u g and is fed to the pulse width modulator pwm serving as an information signal relating to the actual value of u g moreover with the aid of the ground side series current measuring resistor ri1 there is measured a load current i l which flows in the load circuit the voltage drop across ri1 is likewise fed to the pulse width modulator for serving as an information signal u i relating to the said load current the tapping point for the current representing signal u i i e the point connecting the secondary windings to the current measuring resistor ri1 is also applied across the resistor ri2 to the regulated voltage u g so that this connecting point is also referenced to that voltage fig1 also shows a clock pulse generator tg whose output signal is fed to the pulse width modulator pwm i e serving as the source of clock signal ts horizontal sync pulses hz originate with the synchronizing signal separating stage ss of the television receiver in the conventional manner fig1 while showing the general prior art configuration also shows integration of the apparatus of the invention into a regulator with.