The electrical signal is amplified electronically, with an increase in signal power occurring at the expense of the input AC power to the amplifier.

电信号被用电子的方法放大，即利用输入放大器的交流电能将信号的功率放大。

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Because of the stability of LED current, these designs provide an expanded input-ac-voltage range, which may be useful for a multistandard ac-powered gadget;

由于LED电流的稳定性，这些设计使输入交流电压的范围扩大，其有利于多标准交流供电设计；

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Because of the stability of LED current, these designs provide an expanded input-ac-voltage range, which may be useful for a multistandard ac-powered gadget;

由于LED电流的稳定性，这些设计使输入交流电压的范围扩大，其有利于多标准交流供电设计；

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