In a fluid pressure boosting device 1 of the present invention, a control valve 4 is composed of a supply valve 44 and a discharge valve 45, the supply valve 44 comprises an annular valve cone 46 of a poppet type and a first valve seat 7 and the discharge valve 45 comprises an annular valve cone 46 of a poppet type and a second valve seat 8. Each of the series of two or more modular units has a water reservoir, a plurality of high speed solenoids located below the water reservoir, a replaceable nozzle plate having a plurality of spaced apart nozzles wherein one of said plurality of high speed solenoids is connected to each nozzle. The amplifier has an expanded dynamic range with a suppressed noise level. Upon detection of the switch-on of the earmicrophone, the mobile terminal reads the earmicrophone state information from the memory. Alternatively, the thermal cure may be accomplished in an atmosphere not conducive to oxide formation on metallized circuit surfaces.