A voltage amplifier generates a third and a fourth voltage signal based on a detected voltage difference between the first and second voltage signals.

电压放大器基于所述第一和第二电压信号之间的所检测的电压差而生成第三和第四电压信号。

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At first, devices that needed to amplify a signal such as radios and the first, lumbering computers used the vacuum-tube amplifier.

ECONOMIST: The middle age of the transistor