The design rules and observing proceedings are presented from the layouts, wires placing and grounding of the printed circuit board (PCB) aiming at the EMC design of switch power supplies.

针对开关电源印制电路板的电磁兼容性设计，从PCB的布局与布线、接地等方面提出设计原则及注意事项。

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A power supply, the timer and the gear dividing switch are switched on by the circuit board.

通过接线板接通电源、定时器及分挡开关。

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"If you switch on a cellphone on board, and there's no network, it will gradually increase the power it's transmitting because it's trying to get hooked on a network which doesn't exist, " he said.

CNN: In-flight phone calls to become standard, say experts