dc amplifier meaning in English

直僚大器
直僚非常大，不小了器
直流放大器

Because of signal proportional valves with the ratio between the need to install dc amplifier , a corresponding increase in investment costs
由于在输入信号与比例阀之间需设置直流比例放大器，相应增加了投资费用。
Chapter two focuses on the architecture and circuit design of asna2001 . three parts are included : power supplier , ad dc amplifier and stepping - motor driver . circuit diagrams , design thoughtway and some calculation are provided
第二章说明了asna2001标量网络分析仪的工作原理与电路设计，这主要包括了三个方面：电源电路、 ad da放大电路和步进电机驱动电路。