外文翻譯----led顯示屏的數(shù)字電壓表(完整版)
【正文】 置過程中顯示為零。為了保護(hù)印刷電路板 在 存儲 過程中 被氧化 和 保證它到達(dá)你 所要求的 完美的條件，在 生產(chǎn)過程中將 銅 鍍錫的同時起表面還要覆蓋一層 特殊 的 漆， 這樣不僅防止了它被 氧化，也使焊接更容易。 不使用助焊劑除了在 你 的 焊接 劑 里已含有 助焊劑。 安置 部分 印刷電路板尺寸： 77,6 毫米 44,18 毫米或 35％的范圍內(nèi)做 拿著 熱鐵 將其尖端放在 組件的一角 上 ， 同時將焊錫絲末梢放在尖端的一個點(diǎn)上 。 在 你焊接一個敏感元件 時 ，很好的做法 是用 一個長鼻子鉗子 夾著電路板組件的邊緣進(jìn)行 熱轉(zhuǎn)移 但是那樣容易損壞組件。在光顯示區(qū)應(yīng)立即形成一個數(shù)字。 附件 2：外文原文 Led display digital Voltmeter source: Smart Kit front side Copyright of this circuit belongs to smart kit electronics. In this page we will use this circuit to discuss for improvements and we will introduce some changes based on original schematic General Description This is an easy to build, but nevertheless very accurate and useful digital voltmeter. It has been designed as a panel meter and can be used in DC power supplies or anywhere else it is necessary to have an accurate indication of the voltage present. The circuit employs the ADC (Analogue to Digital Converter) . CL7107 made by INTERSIL. This IC incorporates in a 40 pin case all the circuitry necessary to convert an analogue signal to digital and can drive a series of four seven segment LED displays directly. The circuits built into the IC are an analogue to digital converter, a parator, a clock, a decoder and a seven segment LED display driver. The circuit as it is described here can display any DC voltage in the range of 01999 Volts. Technical Specifications Characteristics Supply Voltage: ............. +/ 5 V (Symmetrical) Power requirements: ..... 200 mA (maximum) Measuring range: .......... +/ 01,999 VDC in four ranges Accuracy: ....................... % FEATURES Small size Easy construction Low cost. Simple adjustment. Easy to read from a distance. Few external ponents. How it Works In order to understand the principle of operation of the circuit it is necessary to explain how the ADC IC works. This IC has the following very important features: Great accuracy. It is not affected by noise. No need for a sample and hold circuit. It has a builtin clock. It has no need for high accuracy external ponents. Schematic (fixed 161109) 7segment display pinout MAN6960 An Analogue to Digital Converter, (ADC from now on) is better known as a dual slope converter or integrating converter. This type of converter is generally preferred over other types as it offers accuracy, simplicity in design and a relative indifference to noise which makes it very reliable. The operation of the circuit is better understood if it is described in two stages. During the first stage and for a given period the input voltage is integrated, and in the output of the integrator at the end of this period, there is a voltage which is directly proportional to the input voltage. At the end of the preset period the integrator is fed with an internal reference voltage and the output of the circuit is gradually reduced until it reaches the level of the zero reference voltage. This second phase is known as the negative slope perio
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鄂ICP備17016276號-1