Half four-bit LCD digital display voltmeter circuit

Published:2011/5/13 2:56:00 Author:Nicole | Keyword: LCD, voltmeter | From:SeekIC

This half four-bit LCD digital display voltmeter is composed of ICL7129 single chip CMOS IC, and with a matrix multichannel scanning(100Hz) LCD digit display device, it is suitable for producing high resolution pocket multimeter. it has the function of automatic zero adjustment and do not need a external connected zero adjustment capacitor, it only needs 9V power supply, the power consumption is 1mA, the transpositional speed is 2/s, the measuring range of direct input analog voltage is ±200mV, the highest resolution is 10μV, it also has the functions of identifying alarm and displaying with lower than 7.2V power voltage. It can use OR/UR terminal to achieve range automatically transforming, the CMRR is 11dB.



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