make this simple digital voltmeter

  
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The post explains a very simple digital panel type voltmeter circuit using a single IC L7107 and a few other ordinarycomponents. The circuit is able to measure voltages right up to 2000 AC/DC V. Making this simple digital panel voltmeter circuit is particularly easy due to the availability of the A/D voltage processor chip in the form of IC L7
make this simple digital voltmeter - schematic

107. Thanks to Intersil for providing us with this wonderfullittleIC L7107 which can be easily configured into a wide range digital voltmeter circuit using a few number of common anode seven segment displays. The IC 7107 is a versatile, low consumption 3 and 1/2 digit A/D converter IC which has in-built processors such as seven segment decoders, driver for displays, set reference levels and clock generators. The IC not only works with ordinary CA seven segment displays but also with liquid crystal displays (LCDs) and has an in-built multiplexed backplaneilluminator for the connected LCD module. It ensures auto zero correction for inputs less than 10uV, a zero drift for inputs below 1uV/oC, bias current for inputs of maximum 10pA and cross over error of less than a single count. The IC can be set with ranges as high as 2000 V AC/DC, and as low as 2mV, the later makes the IC very suitable for measuring low inputs from sensors like load cells, piezo transducers, straingauges and similar bridged transducer networks. In other words, te chip may be simply configured for making products likedigitalweighing scale, pressure meters, electronic strain gauge, vibration detector, shock alarms and many similar circuits. Referring to the circuit diagram below, the unit is a full fledged digital voltmeter circuit which can be used for measuring direct voltages right from zero to 199 volts. The range can be appropriately widened or...



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