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Thread: Voltage comparator help

  1. #1
    Thread Killer Illum's Avatar
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    Default Voltage comparator help

    Saw this and liked it: http://www.circuitstoday.com/car-bat...cuit-using-led







    Question is, if I have 3 LM324s, what resistors do I need to change [and add] to get the following voltage readouts on the output pins of the comparators? Assuming all resistors can be set to exact values using trimpots



    12.0 12.1 12.2 12.3 12.4 12.5 12.6 12.7 12.8 12.9 13.0 13.1

  2. #2
    Flashaholic
    Join Date
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    Default Re: Voltage comparator help

    I'd go with an A/D convertor and use digital decoding to light the 12 LEDs.

    Another way is to use a 12.0v electronic Zener to make an expanded scale analog voltmeter. Much simpler circuitry; one trimpot, one Zener, one meter movement but you have to hand-draw the meter scale face.
    Last edited by xul; 11-02-2011 at 06:39 PM.

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