[car battery tester]

R Hi and R Lo determine the end points.

MP

thanks for replying. what resistor values should I use to display a range between 11 and 14.4 volts

[car battery tester]

hello, I am new in the forum and new with electronics also.
I am trying to built this circuit but I wonna display a range between 11 and 14.4 volts.
I would be grateful if someone could describe how lm3914 works and furthermore help me calculate the resistor values for this range.

I already have download the datasheet  http://www.national.com/ds.cgi/LM/LM3914.pdf
and a sample circuit  http://www.national.com/an/LB/LB-48.pdf  but with my limited knowledge on electronics  were not that helpful.