BAR_GRAPH_READOUT_VOLTMETER

Published:2009/7/14 23:38:00 Author:Jessie | From:SeekIC

Sections of RS339 quad comparator each drive LED to give indications of four different input voltage levels, While LED 1 is connected to ground for use as zero indicator Resistors shown are for Radio Shack 276-041 red LEDs；change R6-R9 to 270 ohms and R1 to 470 ohms for green LEDs Pot R1 is used to calibrate voltage divider R2-R5 With R1 set allow resistance, comparators turn on at intervals of 1 V or more，With high resistance for R1, comparators turn on at fractional-volt intervals. –F. M. Mims,” Integrated Circuit Projects, vol. 4,” Radio Shack, Fort Worth, TX, 1977, 2 nd Ed., ρ76-85.



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