Switching power supply or DC power to AC power through it will be a stable DC voltage source.

开关电源把直流电源或交流电源通过它可以获得一个稳定的直流电压源。

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Communication power supply is the power source of communication equipment.

通信电源是通信设备的动力之源。

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Timing circuit is usually made up of power supply unit, panel circuit and timing board, it is the digital control part of power source.

定时电路一般由电源模块、面板电路和定时板组成，是功率源中的数字控制部分。

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Each unit can also serve as a source of electrical power for the military, or emergency response, something always in short supply in forward operating positions.

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Autonomous control over supply, via aggregation in unions, became their only source of power.

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