Durable Laptop Batteries
Designing a Li-Ion Battery Gauge with the LM3914 – EEVblog #204
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.
Video Rating: 4 / 5
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Hi I really like your videos, i? have learnt a lot thanks. Im from Mexico, just one quiestion what breadboard do yo use and where can i buy it from Mexico? My breadboard is a generic one, and i want a professional as yours. Thanks a lot
would this work for? 1 li-ion cell? and what resistor values should I use (i’m too lazy to calculate
04:45 LOL, major typo: “constant cOrrent”?
Great Stuff, I love the way you explain, demonstrate and? prove your projects. Can’t beat this thread for electronic knowledge…
thanks
Your stuff is sweet. I love this circuit. Thinking of building it myself.
I watch all your tutorial? vids and I can’t enough! They demystify the mystifying!
A big and warm THANK YOU from me!
This was fun and? intuitive.. thanks
Skip? to 44:09 – Dave, I thought exactly the same thing the other day, when pulling resistors off a strip for my breadboarding. I used my side cutters and trimmed the gluey ends off. You could clean/sand the glue off, but for a prototype… is it worth the work?
why should there be a point??
I am. Is there a point??
i dont know why but i actually assumed that you are an? atheist
Man, wonderful job! Congratulations! And, please, keep doing? it!
Very interesting? !! Enjoyed it.
Is there a smaller chip for 4Peds?
This is great!
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That’s just beautiful
?
Hy:
Im a studetn of Electrical engineering but also ive started to make experiments on my own and i? want to purchase a? small dual output dc power supply or something preferbly not to expensive is just for conducting small experiments i wonder if u could recomend something thank you my best regards and congrats on the blogs.
what? happens at 2V in dot mode?
thanks? a lot for the great video.
thanks for another great video Dave, i learned? alot
I like the way Dave pronounces 13 and 18.?
Very? illustrative the uses of comparators, where can I buy the batteries? (I am from Mexico)
WE WANT? MORE LIKE THIS…. SIMPLE OLD SCHOOL ELECTRONIC CIRCUITS!!!
That’s in parallel with the external resistor R1, so it is taken into? account. There is no extra current that flows out of it, so no additional error term to worry about.
Dave, what about current, which goes through 1k resistor divider network and comes through Rlo out and changes? IADJ value?
I mentioned? that at the beginning, using a variable lab power supply.