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The computer separately connects and controls the I/O end and A/D converter; the I/O end connects and controls the X, Y axis driving circuit and the semiconductor laser; the X, Y axis step-by-step driving circuit connects and controls the X, Y step-by-step electrical machines to control the dimensional platform; the beam of the semiconductor laser passes through the focusing drawtube with 0.1mm diameter to form the facula with the diameter less than 0.1mm; the facula irradiates on the detector surface of the XY dimensional displacement platform to produce the corresponding electric signals; the detector surface connects the A/D converter through the amplifier; the electrical signal is amplified and is converted into the data signal by the A/D converter and is sent to the computer for processing.

由计算机分别连接并控制I/O端口和A/D转换器，I/O端口分别连接并控制X、Y轴步进电机驱动电路和半导体激光器，X、Y轴步进电机驱动电路分别连接并控制X、Y轴步进电机，从而控制二维位移平台，半导体激光器的光束经过设有直径0.1mm小孔的聚焦镜筒形成＜0.1mm直径的光斑，光斑照射于设在XY二维位移平台上的探测器表面使其产生响应的电信号，探测器表面经放大器连接A/D转换器，电信号经放大器放大后，由A/D转换器转换为数据信号送计算机处理。

At that time,according to input-output relation of operational amplifier,a dry battery was used to produce a fixed voltage to simulate the input signal and then make the oil mist detector work normally.

针对该故障当时的情况，利用运算放大器输入输出关系，采用由干电池产生一固定电压模拟输入信号的方法，使报警器恢复正常。

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Its work principle is to make use of new-style DAC, operation amplifier and dynatron and so on to construct invariance current circuit controlled by program, and reso...

介绍了方案的工作原理，根据光学特征点———红外发光二极管的光学特性，运用新型D/A转换器、运算放大器及三极管等构成可程序控制的恒流源电路，解决了发光二极管控制过程中的电流调整困难、工作过程中发热、管耗高等问题。

Results of experiments shows that the power amplifier have good performance in some aspects, such as bandwidth, distortion factor , efficiency, and so on.

实验结果表明该功率放大器在带宽、失真度、效率等方面具有较好的指标、较高的实用性，为功率放大器的设计提供了广阔的思路。

The principle of the project consists of various sensors, electric charge amplifier and data processing equipment.

再通过相关的公式，得到对应的擦伤深度值，这样可以方便及时的了解车轮的擦伤状况。

It is Y type of reflective fiber- optic probe head adapted in the paper that integrates micro-displacement and surface roughness measurement device which is composed of Luminescence Diode Phase Locking Amplifier, Fiber-optic probe head Electric eye and so on.

本论文采用Y型反射式光纤探头构建了微位移及表面粗糙度检测装置，主要由发光二极管、锁相放大器、光纤探头、光电池及相关电路组成。

A kind of low-noise amplifier is designed according to the electric characteristic of skin electric potential.

根据皮肤电位的电特性，设计出一种低噪声放大器，并计算和分析了这种放大器的噪声因子，计算和分析结果表明该放大器是能够用于检测皮电信号的低噪声放大器

Low noise amplifier can amplify own noise, but its resistance and electric capacity noise should be low.

低噪声放大器除了放大自身噪声外，还需要电阻、电容的噪声也很低。

At present, switching power amplifier becomes the research focus of power electrics field.

本文以开关功率放大器为基础，在分析引起开关功率放大器输出失真的原因的基础上，提出了一种开关功率放大器的新型控制方法。

The two-acre Dunbar Community Garden in Little Rock has served as a model for several years.

几年来，坐落于小石城，占地两英亩的邓巴社区菜园树立了一个标杆。

Jerry points to the jacket hanging in the bathroom. It's ruined, and unwearable What?

杰瑞指着洗手间里挂着的夹克，毁了，不能穿了）什么？