BAR GRAPH READOUT VOLTMETER


Posted on Feb 6, 2014

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 all


BAR GRAPH READOUT VOLTMETER
Click here to download the full size of the above Circuit.

ow 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. , 76-85.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Room thermometer with LEDs
    Pulse-Width-Modulated Motor-Speed Control Circuit
    schematics Use of ground symbols in circuit diagrams
    pic thermometer
    Arduino-Board
    El-Cheapo Fluoro Ballast
    SEISMIC RADIO 500mHz - 200Hz frequency range



    Top