外文翻译LED显示屏数字电压表(适用于毕业论文外文翻译中英文.doc

w 外文文献原稿和译文 原 稿Front side Copyright of this circuit belongs to smart kit electronics. In this page wewill use this circuit to discuss for improvements and we will introduce somechanges based on original schematicGeneral Description This is an easy to build but nevertheless very accurate and useful digitalvoltmeter. It has been designed as a panel meter and can be used in DC powersupplies or anywhere else it is necessary to have an accurate indication of thevoltage present. The circuit employs the ADC Analogue to Digital ConverterI.C. CL7107 made by INTERSIL. This IC incorporates in a 40 pin case all thecircuitry necessary to convert an analogue signal to digital and can drive aseries of four seven segment LED displays directly. The circuits built into theIC are an analogue to digital converter a comparator a clock a decoder and aseven segment LED display driver. The circuit as it is described here candisplay any DC voltage in the range of 0-1999 Volts.Technical Specifications - Characteristics Supply Voltage: /- 5 V Symmetrical Power requirements: 200 mA maximum Measuring range: /- 0-1999 VDC in four ranges Accuracy: 0.1 FEATURES Small size Easy construction Low cost. Simple adjustment. Easy to read from a distance.w Few external components.How it Works In order to understand the principle of operation of the circuit it isnecessary to explain how the ADC IC works. This IC has the following veryimportant features: Great accuracy. It is not affected by noise. No need for a sample and hold circuit. It has a built-in clock. It has no need for high accuracy external components. Schematic fixed 16-11-09w 7-segment display pinout MAN6960 An Analogue to Digital Converter ADC from now on is better known asa dual slope converter or integrating converter. This type of converter isgenerally preferred over other types as it offers accuracy simplicity in designand a relative indifference to noise which makes it very reliable. The operationof the circuit is better understood