Abstract: This printed circuit board (12) comprising: a first portion (20) having first electronic components (22) of which the earth electrode is on a first voltage source (14); a second portion (24) having second electronic components (26) of which the earth electrode is on a second voltage source (16); a third portion (28) inserted between the first portion (20) and the second portion (24); a switched-mode power supply circuit (32) connecting the first portion (20) and the second portion (24); the said second portion (24) also comprising an electronic component (30) powered by the said first voltage source (14), is characterized in that it also comprises detection means (34) for detecting a drop in electrical consumption of the component (30) and switching means for switching the switched-mode power supply circuit (32) when a predetermined drop in electrical consumption of the said component (30) is detected.

Abstract: This printed circuit board (12) comprising: a first portion (20) having first electronic components (22) of which the earth electrode is on a first voltage source (14); a second portion (24) having second electronic components (26) of which the earth electrode is on a second voltage source (16); a switched-mode power supply circuit (34) of which one input is connected to the first portion (20) and of which at least one output is connected to the second portion (24), is characterized in that it comprises modification means (36) for modifying a switching frequency of the switched-mode power supply circuit (34) depending on data values (32) to be transmitted between the first portion (20) and the second portion (24), the said data being able to take at least two distinct values.

Abstract: The respective spaces for forming gas passages on the suction side formed on the front and rear side cylinder blocks are assembled together to configure a gas passage on the suction side, and the respective spaces for providing gas passages on the discharge side are connected with each other to configure a gas passage on the discharge side. A gas port leading to the suction side space is provided on one of both cylinder blocks, and a gas port leading to the discharge side space is arranged on the other. A circumferential width of the space for forming a gas passage communicating with the gas port is made larger than a circumferential width of a space for forming a gas passage not communicating with the gas port in the respective cylinder block. Partition walls are contacted with each other in the axial direction when both cylinder blocks are assembled.