Voltage comparator help

Illum

Flashaholic
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Apr 29, 2006
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Central Florida, USA
Saw this and liked it: http://www.circuitstoday.com/car-bat...cuit-using-led



b874ma.jpg




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?:duh2: 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
 

xul

Enlightened
Joined
Aug 28, 2011
Messages
336
Location
MD
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.
 
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