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lm3914 calculation

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Twiggy

New Member
Hey guys, using this schematic (national datasheet), and do not quite understand the calculations for the resistors. Can someone explain to me how I would configure the resistor values to have the full power at 1.5 volts, least at 0v and 0.15 power increments. This is for measuring batteries. thanks in advance, twiggy.
 
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MikeMl

Well-Known Member
Most Helpful Member
1.5 = 1.25(1+R2/R1), where 1.5V is your full scale voltage, and 1.25 is the internal reference.

Solving for R2/R1 = 1.5/1.25 - 1 = 0.2

So make R2 = 200Ω and R1=1K
 

Twiggy

New Member
thanks for your help. very useful.
 
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