The object of the present invention is to obtain a contact pressure control device capable of carrying out feedback control enduring a practical use by inventing a pressure detecting means and the employment structure of the same. The two films are then exposed to anneal steps at suitable temperatures to cause their interdiffusion and an ultimate formation of Ni2Si and Pt2Si contacts to the silicon surface. The current sensor produces a first signal representative of current drawn from a battery. For the latch, the clocking defines a window in time during which the latch is prevented from receiving data, and in a synchronized manner the clocking is enabling a response in the observing circuit. Buttons can be removably coupled to the cable connectors, and can also include dynamic displays thereupon. The connection wiring of connecting the upper surface electrode and at least one of the input terminal, the output terminal, and the ground terminal is constructed using an inner conductor passing through the inside of the magnetic substrate, and the connection wiring forms an inductor.