A working tool, in particular a soil rammer or a hammer, has two masses that may be linearly moved back and forth with respect to one another, namely a top mass which comprises a driving motor and a ramming or striking working mass which can be moved by the motor relative to the top mass by means of a crank drive and a set of springs. Each of the trenches has a sidewall and a bottom. A second capacitor is formed in the insulating layer at the logic circuit section. The ink from the ink pool chamber flows in a regular manner and no stagnation is generated, and bubbles are smoothly eliminated.