EEVblog #204 – Designing a Li-Ion Battery Gauge with the LM3914


How to design, prototype and test a two cell 18650 Lithium Ion battery pack level gauge using the classic LM3914 dot/bargraph display driver chip.
A favorite from Dave’s youth!
Dave gives you all you need to know to implement a simple expanded scale voltmeter with the LM3914, without adjustment pots to tweak.
This one works from 6V to 8.4V – the usable capacity of a two 2 cell 4.2V Li-Ion batttery pack.

About EEVblog

Check Also

EEVblog #1098 – 4K Video Editing PC Build

Dave builds a new i7 7820X based 4K video editing machine into an old Fractal ...

The EEVblog Store generally ships twice a week, on Tuesdays & Fridays, Sydney time. Dismiss