In electronics, a circuit for converting AC voltage to low voltage DC in such a way that the output is regulated to minimize noise and voltage fluctuation.

在电子技术中，把交流电转换成低电压直流电的一种电路。这种电路的输出是经过调整的，使它的噪声及电压波动都很。

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With high performance, complete functions, low price. Used at AC or DC.

具有功能齐全的交、直流多用低价格、高性能焊接机。

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RF (or microwave) signals have switching considerations that differ from those for DC or low frequency AC signals.

射频（或微波）信号的切换不同于直流（DC）或低频交流（AC）信号。

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Running an AC unit without a low-pressure cutoff switch when it's colder than about 60 degrees might damage it, says Troy Gregory, president of Standard Heating and Air Conditioning.

WSJ: Don't Wait to Service AC Units