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Led display digital Voltmeter

2016-12-01 12:23  
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Led display digital Voltmeter
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) I.C. 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 comparator, 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 0-1999 Volts. Technical Specifications - CharacteristicsSupply Voltage: ............. +/- 5 V (Symmetrical)Power requirements: ..... 200 mA (maximum)Measuring range: .......... +/- 0-1,999 VDC in four rangesAccuracy: ....................... 0.1 %FEATURES- Small size- Easy construction- Low cost.- Simple adjustment.- Easy to read from a distance.- Few external components. How it WorksIn 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 built-in clock.- It has no need for high accuracy external components.