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Thread: Voltage comparator help

  1. #1
    Thread Killer Illum's Avatar
    Join Date
    Apr 2006
    Central Florida, USA

    Default Voltage comparator help

    Saw this and liked it:

    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
    Join Date
    Aug 2011

    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 07:39 PM.

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