Electrical Engineering Stack Exchange
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Questions tagged [lm3915]

A "Dot/Bar Display Driver". Drives 10 LED's at -3 dB per LED, for a range of 30 dB.

A "Dot/Bar Display Driver" used to create "high rise displays" from an analog input.

Functional Diagram

Functional Diagram from TI's product page.

Typical Application

Typical Application from TI's product page.

See Also

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What transistor if they are needed do I need to drive 5 blue LEDs on a lm3915 and how should I hook it up?

I am using an LM3915 LED driver in dot-mode. I would like to drive 5 blue LEDs (3.3V forward voltage @ 20mA per LED) per output. What type of transistor should I use to make this happen? And how do i put the transistors in the circuit i was…
Danny
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LM3915 Circuit how to adjust input level?

I have used the circuit diagram that is on page 2 of this datasheet and it works pretty much. I am getting the signal off the output of my computer which has been cut and then feed into my circuit and to the Logitech speakers I run my sound…
Ashley Hughes
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LM3915 questions about data sheet and operation

I am connecting the LM3915 to a PNP transistor to drive LEDs. I have it working in bar graph mode using one LED per output directly (no transistor). On page 7 of the datasheet, it looks like pins 1,10-18 should put out a "0" when in the ON state.…
Tom
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