A system and a method are provided for assembling a customized printed circuit board having at least one electrical component. A trench is formed in an insulating layer and impurities are added to an oxide semiconductor film in contact with an upper end corner portion of the trench, whereby a source region and a drain region are formed. The noble metallic tip of the ground electrode possesses excellent oxidative and volatile resistance compared with a noble metallic tip of a center electrode. A first device provides an input signal to an electrical node positioned between the emitter of the transistor and the current source. Such degradable balls may be useful in sealing segments of a wellbore and actuating wellbore tools.