Electronics > Beginners

How to use LM3914 bar graph to indicate 7S Li-ion

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anishkgt:
This is what Dave does in his video ()

StillTrying:
"I mean why does RHI have to be lower than 3v"

The whole LM3914 is only powered by 3V when it's cell is only 3V, so the Refs have to be less than that.

"when it should be 4.2v"

The 2 10ks on SIG divide the 4.2V down to 2.1V, so RHI should be 2.1V.

anishkgt:
Well i guess a 500K would be just fine i get about 1.21v

StillTrying:
Get anywhere?  :)
There's an LTspice LM3915, which might help a little bit.

anishkgt:
Yea figured it out. R1 and R2 remains as dave suggested. Just removed the lower resistor R7 and connected R5 between BAT and pin 5.

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