A common driver circuit for driving a load heavy in a capacitive property such as a common electrode or the like of a liquid crystal panel is composed of the simple circuit construction provided with each circuit of the voltage follower, the low-pass filter, the feedback, the control so that the variation in the direction current component which gives bad influences in the processing of the signals of this type of circuit is restrained to improve the reliability, and the direct current is not required to be cut to eliminate the direct current cutting capacitor of the large capacity.