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How can i make a 4 to 9v voltmeter using lm3914 and how to compute the resistors? Answered

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5 years ago

Why would you use a lm3914 bargraph LED generator? You are not going to get precise readings at all, with only 1 sig fig of resolution. Presumably to test 9V batteries? If anything use a few 7 segment LED drivers and a 8 or 10 bit ADC with a parallel output to drive the digital inputs of the 7 segments. That way you can get a nicer digital readout with 3.00 significant figures.

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steveastrouk
steveastrouk

Answer 5 years ago

Because its overkill ?

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Answer 5 years ago

Yeah, probably. But I like acuracy and presicion.

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steveastrouk
steveastrouk

Answer 5 years ago

I see what you did there.

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Answer 5 years ago

Whoops! Seplenig mistaeks!!!! I hate those!

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steveastrouk
steveastrouk

5 years ago

Here is the original circuit

http://www.electronicshub.org/battery-level-indicator/