Operational amplifier is the most versatile signal conditioning block in any portable system. It can be a filter, an amplifier, an voltage detector, a level shifter, a buffer or even a switch.

对于便携式电子产品来说，运算放大器可算是万能的信号调节电路，因为它可以执行滤波器、放大器、电压感测器、电平移位器、缓冲器、甚至开关等多种不同功能。

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With a supply current of just 6mA per amplifier and the ability to run from a single supply voltage from 5V to 10V, the EL5392A is also ideal for hand held, portable or battery powered equipment.

随着供应仅为放大器和能力，从单电源运行电压从5V至10V6毫安电流，EL5392A也是手持，便携式或电池供电的理想设备。

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The project is designed with high efficiency, energy saving, digital, small volume features of the D for audio amplifier core portable digital megaphone.

摘 要 本项目设计的是以具有高效、节能、数字化、体积小等特点的D类音频缩小器为中心的便携式数字扩音器。

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Case in point: the Icon iDo integrated digital-to-analog converter (also called a DAC) and integrated amplifier is geared specifically toward Apple portable devices like the iPhone and iPad.

FORBES: How Nuforce is Reinventing High-End Audio for the Digital Age